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Stock Repurchases - Value of Common Stock Shares Repurchased (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity, Class of Treasury Stock [Line Items]      
Private transaction     $ 14,927
Repurchase program   1,201 3,099
Exercise of stock options 405 1,660 1,651
Total 1,822 3,100 20,397
Stock Option [Member]
     
Equity, Class of Treasury Stock [Line Items]      
Tax withholding obligations 194 949 1,658
Restricted Stock [Member]
     
Equity, Class of Treasury Stock [Line Items]      
Tax withholding obligations $ 1,628 $ 950 $ 713