Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
State and Local Jurisdiction [Member]
Dec. 31, 2013
United States Federal Income Tax Authority [Member]
Income Taxes [Line Items]        
Net short-term deferred tax asset $ 15,900,000 $ 16,500,000    
Net long-term deferred tax asset 3,900,000 4,300,000    
Net long-term deferred tax liability 31,552,000 10,768,000    
Gross deferred tax assets related to state net operating loss carryforwards 283,600,000      
Operating loss expiration date     Net operating loss carryforwards that will expire between 2015 and 2032  
Valuation allowance related to certain state net operating loss carryforward deferred tax assets 6,800,000      
Operating loss expiration, beginning year     2015  
Operating loss expiration, ending year     2032  
Liabilities recorded related to unrecognized tax benefits   11,500,000    
Liabilities related to interest and penalties 1,100,000 2,400,000    
Unorganized tax benefit would affect income tax rate if recognized $ 3,000,000 $ 5,500,000    
Income tax examination range upper limit     2013 2013
Income tax examination range lower limit     2006 2010