Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Status of Non-Vested Restricted Stock and Restricted Stock Unit Grants Related to Stock Plans (Detail)

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Employee Benefit Plans - Status of Non-Vested Restricted Stock and Restricted Stock Unit Grants Related to Stock Plans (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]  
Non-vested Restricted Stock and Restricted Stock Units, Beginning Balance 827
Non-vested Restricted Stock and Restricted Stock Units, Granted 561
Non-vested Restricted Stock and Restricted Stock Units, Forfeited (193)
Non-vested Restricted Stock and Restricted Stock Units, Vested (390)
Non-vested Restricted Stock and Restricted Stock Units, Ending Balance 805
Weighted Average Grant Date Fair value, Beginning Balance $ 15.53
Weighted Average Grant Date Fair Value, Granted $ 23.10
Weighted Average Grant Date Fair Value, Forfeited $ 20.64
Weighted Average Grant Date Fair Value, Vested $ 13.78
Weighted Average Grant Date Fair value, Ending Balance $ 20.42