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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |
Beginning balance, unrecognized tax benefits | $ (94,962) | $ (35,826)
Gross increases - tax positions in prior period | (22,229) | (49,412)
Gross decreases - tax positions in prior period | 17,390 |
Gross increases - current-period tax positions | (45,262) | (18,861)
Decreases relating to settlements | 218 | 4,619
Reductions as a result of lapse of statute of limitations | 3,680 | 4,531
Foreign exchange movement | 1 | (13)
Ending balance, unrecognized tax benefits | $ (141,164) | $ (94,962)

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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