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Stock-Based Compensation - Information about Options Exercised (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Share Based Compensation Arrangement By Share Based Payment Award Options Activity [Abstract]          
Options exercised     217,003   217,003
Total intrinsic value of exercised options         $ 1,470
Fair value of vested stock options 17 22   17 22
Tax benefits realized         $ 437