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Summary of Significant Accounting Policies - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Changes in Accumulated Other Comprehensive Loss by Component      
Beginning balance $ 3,450,451    
Other comprehensive (loss) income before reclassifications, net of tax 36,902 $ (292,329)  
Amounts reclassified from accumulated other comprehensive loss, net of tax 59,394 29,843  
Net current period other comprehensive income (loss) 96,296 (262,486)  
Ending balance 3,674,707 3,450,451  
Cash Flow and Net Investment Hedges      
Changes in Accumulated Other Comprehensive Loss by Component      
Beginning balance 10,726 (17,388)  
Other comprehensive (loss) income before reclassifications, net of tax 11,237 26,563  
Amounts reclassified from accumulated other comprehensive loss, net of tax 2,380 1,551  
Net current period other comprehensive income (loss) 13,617 28,114  
Cumulative effect of new accounting principle in period of adoption     $ 0
Ending balance 24,343 10,726  
Foreign Currency Translation      
Changes in Accumulated Other Comprehensive Loss by Component      
Beginning balance (499,482) (266,247)  
Other comprehensive (loss) income before reclassifications, net of tax 3,545 (233,235)  
Amounts reclassified from accumulated other comprehensive loss, net of tax 34,701 0  
Net current period other comprehensive income (loss) 38,246 (233,235)  
Cumulative effect of new accounting principle in period of adoption     0
Ending balance (461,236) (499,482)  
Accumulated Other Comprehensive Loss      
Changes in Accumulated Other Comprehensive Loss by Component      
Beginning balance (1,115,078) (852,592)  
Cumulative effect of new accounting principle in period of adoption     (122,526)
Ending balance (1,141,308) (1,115,078)  
Pension Benefits | Accumulated Defined Benefit Plans Adjustment Attributable to Parent      
Changes in Accumulated Other Comprehensive Loss by Component      
Beginning balance (624,539) (567,443)  
Other comprehensive (loss) income before reclassifications, net of tax 22,119 (85,677)  
Amounts reclassified from accumulated other comprehensive loss, net of tax 22,646 28,581  
Net current period other comprehensive income (loss) 44,765 (57,096)  
Cumulative effect of new accounting principle in period of adoption     (122,526)
Ending balance (702,300) (624,539)  
Other Post-Retirement Benefits | Accumulated Defined Benefit Plans Adjustment Attributable to Parent      
Changes in Accumulated Other Comprehensive Loss by Component      
Beginning balance (1,783) (1,514)  
Other comprehensive (loss) income before reclassifications, net of tax 1 20  
Amounts reclassified from accumulated other comprehensive loss, net of tax (333) (289)  
Net current period other comprehensive income (loss) (332) (269)  
Cumulative effect of new accounting principle in period of adoption     $ 0
Ending balance $ (2,115) $ (1,783)