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Stock-Based Compensation (Restricted Stock Awards) - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized compensation expenses $ 1,124   $ 1,258   $ 3,072 $ 4,047
Total unrecognized compensation expense, Nonvested restricted stock arrangements granted $ 7,401   $ 8,986   $ 7,401 $ 8,986
Recognition of remaining compensation expense over a weighted-average period         18 months  
Awards issued during the period   102,440   83,260    
Time-based Restricted Stock Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards issued during the period 0       0