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Employer Share Plans - Schedule of Share-Based Compensation Awards (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]        
Stock options $ 641 $ 639 $ 1,956 $ 2,088
Restricted stock awards 1,184 711 2,856 2,186
Total stock-based compensation expense $ 1,825 $ 1,350 $ 4,812 $ 4,274