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Employer Share Plans - Schedule of Share-Based Compensation Awards (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Compensation And Retirement Disclosure [Abstract]      
Stock options $ 2,748 $ 2,981 $ 3,137
Restricted stock awards 2,907 2,907 2,817
Total stock-based compensation expense before income tax benefit $ 5,655 $ 5,888 $ 5,954