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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
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Stock Options Number of Options beginning balance 5,815 5,330
Stock Options Number of Options Granted   685
Stock Options Number of Options Exercised (1,725) (1,925)
Stock Options Number of Options Expired (850) (850)
Stock Options Number of Options ending balance 3,240 3,240
Stock Options Number of Options Exercisable 2,055 2,055
Stock Options Weighted Average Exercise Price per Share Outstanding beginning balance $ 4.33 $ 4.29
Stock Options Weighted Average Exercise Price per Share Granted   $ 4.51
Stock Options Weighted Average Exercise Price per Share Exercised $ 3.99 $ 3.98
Stock Options Weighted Average Exercise Price per Share Expired $ 3.90 $ 3.90
Stock Options Weighted Average Exercise Price per Share Outstanding ending balance $ 4.62 $ 4.62
Stock Options Weighted Average Exercise Price per Share Exercisable $ 4.92 $ 4.92
Stock Options Aggregate Intrinsic Value ending balance $ 7,986 $ 7,986
Stock Options Aggregate Intrinsic Value Exercisable $ 4,441 $ 4,441
Stock Options Weighted Average Remaining Term 3 years 7 months 17 days 3 years 7 months 17 days
Exercisable Stock Options Weighted Average Remaining Term 2 years 7 months 24 days 2 years 7 months 24 days
Restricted Stock Number of Shares beginning balance 600 1,152
Restricted Stock Number of Shares Granted 850 850
Restricted Stock Number of Shares Vested    (552)
Restricted Stock Number of Shares ending balance 1,450 1,450
Restricted Stock Weighted Average Grant Date Fair Value per Share beginning balance $ 4.12 $ 4.37
Restricted Stock Weighted Average Grant Date Fair Value per Share Granted $ 4.88 $ 4.88
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 $ 4.56 $ 4.56