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Income Taxes - Reconciliation of Provision for Income Taxes at US Federal Statutory Rate to Provision in Statements of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]        
Provision at US federal statutory rate   $ 143,410 $ 162,370 $ 205,419
Foreign earnings taxed at different rates, including withholding taxes   (51,711) (56,877) (107,409)
Foreign losses without income tax benefit   8,526 5,843 20,140
State and local taxes, net of US federal benefit   3,385 482 3,760
Adjustments to previously accrued taxes   (12,537) (19,134) (55,026)
Adoption of ASU 2016-09 $ (4,300) (4,308) 0 0
Tax restructuring   0 0 12,400
Other   4,955 1,815 8,752
Provision for income taxes   $ 91,720 $ 94,499 $ 88,036