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Stock-Based Compensation - Information about Options Exercised (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award Options Activity [Abstract]    
Options exercised (50,000)   
Total intrinsic value of exercised options $ 1,970   
Tax benefits realized $ 603