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Allocation of Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Continuing operations $ 295,726 $ 446,343 $ 381,013
Discontinued operations     (84)
Gain on discontinued operations     8,918
Income Tax Expense (Benefit), Continuing Operations and Discontinued Operations, Total $ 295,726 $ 446,343 $ 389,847