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Income Taxes - Income Tax Benefits in Shareholders' Equity (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Income tax benefits arising from compensation expense for tax purposes in excess of amounts recognized for financial statement purposes $ 23,311 $ 9,437 $ 20,636