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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Foreign currency translation $ (499,482) $ (266,247)
Unrealized gain (loss) on cash flow and net investment hedges, net of tax 10,726 (17,388)
Unrecognized net actuarial loss, net of tax (623,363) (566,876)
Unrecognized prior service cost, net of tax (2,959) (2,081)
Total accumulated other comprehensive loss $ (1,115,078) $ (852,592)