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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | $ 2,505,381 | $ 2,333,307 | $ 2,572,871
Foreign currency translation (loss) gain | 61,247 | 69,811 | (127,521)
(Loss) gain on derivative instruments, net of tax of $(3.9) million, $(3.6) million and $12.7 million, respectively | (11,272) | (19,008) | 36,799
Pension liability adjustment, net of tax of $(0.8) million, $(0.6) million and $0.3 million, respectively | (6,456) | (3,310) | 2,463
Balance | 1,899,456 | 2,505,381 | 2,333,307
Foreign Currency Translation Adjustments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | (434,633) | (504,528) | (376,740)
Foreign currency translation (loss) gain | 61,532 | 69,895 | (127,788)
Balance | (373,101) | (434,633) | (504,528)
Change in Fair Value of Derivative Instruments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | 24,958 | 43,966 | 7,167
(Loss) gain on derivative instruments, net of tax of $(3.9) million, $(3.6) million and $12.7 million, respectively | (11,272) | (19,008) | 36,799
Balance | 13,686 | 24,958 | 43,966
Pension Plan [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | (5,209) | (1,815) | (4,545)
Foreign currency translation (loss) gain | (285) | (84) | 267
Pension liability adjustment, net of tax of $(0.8) million, $(0.6) million and $0.3 million, respectively | (6,456) | (3,310) | 2,463
Balance | (11,950) | (5,209) | (1,815)
Other Comprehensive Loss [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | (414,884) | (462,377) | (374,118)
Balance | $ (371,365) | $ (414,884) | $ (462,377)

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- Definition Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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