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Share-based Compensation - Share-based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Total share-based compensation $ 479 $ 439 $ 1,088 $ 982
Stock Option Awards [Member]        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Total share-based compensation 327 294 752 687
Restricted Stock Units [Member]        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Total share-based compensation $ 152 $ 145 $ 336 $ 295