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Stock-Based Compensation - Information about Deferred Tax Benefits Recognized Related to Restricted Stock Awards, Paid Dividends and the Fair Value of Vested Restricted Stock (Detail) - Restricted Stock [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred tax benefits recognized $ 532 $ 866 $ 1,076 $ 1,669
Tax benefits realized for restricted stock and paid dividends 240 389 499 701
Fair value of vested restricted stock $ 216 $ 414 $ 1,723 $ 885