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Summary of Nonvested Restricted Common Stock Transactions (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of options, Nonvested at December 31, 2012 1,321
Number of options, Granted   
Number of options, Special dividend 133
Number of options, Cancelled (133)
Number of options, Vested (642)
Number of options, Nonvested at December 31, 2013 679
Weighted average grant date fair value, Nonvested at December 31, 2012 $ 7.91
Weighted average grant date fair value, Granted   
Weighted average grant date fair value, Special dividend   
Weighted average grant date fair value, Cancelled $ 7.23
Weighted average grant date fair value, Vested $ 7.51
Weighted average grant date fair value, Nonvested at December 31, 2013 $ 6.88
Restricted stock based compensation
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of options, Nonvested at December 31, 2012 780
Number of options, Granted 423
Number of options, Special dividend 139
Number of options, Cancelled (99)
Number of options, Vested (431)
Number of options, Nonvested at December 31, 2013 812
Weighted average grant date fair value, Nonvested at December 31, 2012 $ 24.59
Weighted average grant date fair value, Granted $ 36.87
Weighted average grant date fair value, Special dividend $ 38.90
Weighted average grant date fair value, Cancelled $ 30.92
Weighted average grant date fair value, Vested $ 24.31
Weighted average grant date fair value, Nonvested at December 31, 2013 $ 32.81