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Share-Based Compensation - Certain Information Related to Stock Options and Restricted Stock (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock Options Number of Options beginning balance 5,330
Stock Options Number of Options Granted 2,015
Stock Options Number of Options Forfeited (40)
Stock Options Number of Options Exercised (2,330)
Stock Options Number of Options Expired (850)
Stock Options Number of Options ending balance 4,125
Stock Options Number of Options Exercisable 1,900
Stock Options Weighted Average Exercise Price per Share Outstanding beginning balance $ 4.29
Stock Options Weighted Average Exercise Price per Share Granted $ 6.54
Stock Options Weighted Average Exercise Price per Share Forfeited $ 7.33
Stock Options Weighted Average Exercise Price per Share Exercised $ 4.06
Stock Options Weighted Average Exercise Price per Share Expired $ 3.90
Stock Options Weighted Average Exercise Price per Share Outstanding ending balance $ 5.56
Stock Options Weighted Average Exercise Price per Share Exercisable $ 4.83
Stock Options Aggregate Intrinsic Value ending balance $ 36,786
Stock Options Aggregate Intrinsic Value Exercisable $ 18,330
Stock Options Weighted Average Remaining Term 3 years 10 months 10 days
Exercisable Stock Options Weighted Average Remaining Term 2 years 5 months 5 days
Restricted Stock Number of Shares beginning balance 1,152
Restricted Stock Number of Shares Granted 1,000
Restricted Stock Number of Shares Vested (552)
Restricted Stock Number of Shares ending balance 1,600
Restricted Stock Weighted Average Grant Date Fair Value per Share beginning balance $ 4.37
Restricted Stock Weighted Average Grant Date Fair Value per Share Granted $ 5.43
Restricted Stock Weighted Average Grant Date Fair Value per Share Vested $ 4.64
Restricted Stock Weighted Average Grant Date Fair Value per Share ending balance $ 4.94