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Employer Share Plans - Schedule of Share-Based Compensation Awards (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Compensation And Retirement Disclosure [Abstract]        
Stock options $ 666 $ 730 $ 1,315 $ 1,449
Restricted stock awards 932 758 1,672 1,475
Total stock-based compensation expense $ 1,598 $ 1,488 $ 2,987 $ 2,924