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Income Taxes - Income Tax Benefits in Shareholders' Equity (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Income tax benefits arising from compensation expense for tax purposes in excess of amounts recognized for financial statement purposes $ 20,636 $ 14,319 $ 22,835