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Stock-Based Compensation - Information about Options Exercised (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award Options Activity [Abstract]          
Options exercised 80,000   50,000 80,000 50,000
Total intrinsic value of exercised options $ 3,188     $ 3,188 $ 1,970
Fair value of vested stock options   $ 17     17
Tax benefits realized $ 1,192     $ 1,192 $ 603