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Employer Share Plans - Schedule of Share-Based Compensation Awards (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Compensation And Retirement Disclosure [Abstract]        
Stock options $ 564 $ 534 $ 1,143 $ 1,375
Restricted stock awards 869 755 1,699 1,536
Total stock-based compensation expense $ 1,433 $ 1,289 $ 2,842 $ 2,911