Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Additional Information (Detail)

v2.4.0.8
Employee Benefit Plans - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Employer
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Members
Dec. 31, 2012
Stock Option [Member]
Dec. 31, 2011
Stock Option [Member]
Dec. 31, 2013
Non-vested restricted stock [Member]
Dec. 31, 2013
401(k) plan [Member]
Dec. 31, 2012
401(k) plan [Member]
Dec. 31, 2011
401(k) plan [Member]
Dec. 31, 2013
2005 Formula Restricted Stock Plan for Non-Employee Directors [Member]
Plans
Jun. 30, 2009
2004 Stock Incentive Plan [Member]
Common Class A [Member]
Dec. 31, 2013
2004 Stock Incentive Plan [Member]
Common Class A [Member]
Executive Officer [Member]
Dec. 31, 2013
2004 Stock Incentive Plan [Member]
Common Class A [Member]
Stock Option [Member]
Dec. 31, 2013
2004 Stock Incentive Plan [Member]
Common Class A [Member]
Restricted Stock [Member]
Dec. 31, 2012
2004 Stock Incentive Plan [Member]
Common Class A [Member]
Restricted Stock [Member]
Mar. 31, 2012
2012 Plan [Member]
Mar. 31, 2012
2012 Formula Plan [Member]
Dec. 31, 2013
2012 Formula Plan [Member]
Board of Directors Chairman [Member]
Dec. 31, 2013
2004 Plan and 2012 Plan [Member]
Common Class A [Member]
Minimum [Member]
Dec. 31, 2013
2004 Plan and 2012 Plan [Member]
Common Class A [Member]
Maximum [Member]
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Non-vested restricted stock [Member]
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Non-vested restricted stock [Member]
Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
Non-vested restricted stock [Member]
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Non-vested restricted stock [Member]
Selling, General and Administrative Expenses [Member]
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Non-vested restricted stock [Member]
Selling, General and Administrative Expenses [Member]
Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
Non-vested restricted stock [Member]
Selling, General and Administrative Expenses [Member]
Dec. 31, 2013
Plans In Red Zone [Member]
Dec. 31, 2013
Plans In Yellow Zone [Member]
Dec. 31, 2013
Plans In Green Zone [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                            
Employer contribution               $ 7.2 $ 4.4 $ 1.6                                        
Number of active stock compensation plans                     3                                      
Additional terminated plans with outstanding grants                     2                                      
Number of shares authorized                       5,000,000         2,000,000 300,000                        
Number of shares issuable                     0                                      
Stock option expiration period                           10 years                                
Restricted stock vesting period                             3 years 3 years       6 months 3 years                  
Tax benefits recognized related to the compensation expenses   0.1 0.2                                     2.7 1.9 1.2            
Compensation expense 0       0.1 0.4                               10.2     7.2 5.0 3.3      
Restricted stock shares                         538,000           23,000                      
Total compensation cost related to non-vested options not yet recognized             $ 0                                              
Total compensation cost related to non-vested options expected to be recognized over weighted average period             1 year 8 months 12 days                                              
Members of senior management       9                                                    
Number of employers to make contribution under multi-employer plan 200                                                          
Pension Protection 2006 2006                                                        
Multi-Employer Benefit AI Pension Plan                                                       Less than 65 percent Between 65 and less than 80 percent At least 80 percent
Number of employee increase / (decrease) under multi employer benefit percentage 7.10% 5.10%                                                        
Total contributions of multi employer Plan   5.00% 5.00%