Income Taxes - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018	Dec. 31, 2016
Income Taxes [Line Items]
Increase in deferred tax assets	$ 245,000
Loss carryforwards	672,104		$ 672,104
Tax credit carryforwards	52,558		52,558
Increase (decrease) of valuation allowance on deferred tax assets			300,000	$ 291,000
Unrecognized tax benefits, end of period	137,929	$ 119,818	137,929	119,818	$ 116,070		$ 109,347
Amount of unrecognized tax benefits that would impact the effective tax rate if recognized	61,700		61,700
Amount of unrecognized tax benefits that would impact the effective tax rate if recognized and increase the valuation allowance	76,200		76,200
Increase (decrease) in recognized interest and penalties related to unrecognized tax benefits			(1,600)	7,900	1,600
Accrued interest and penalties related to unrecognized tax benefits	24,800	26,400	24,800	26,400
Tax reconciliation related to accumulated foreign earnings, net of related valuation allowance change		3,700	0	3,709	$ (107,049)
Retained earnings (accumulated deficit)	1,413,181	1,626,693	1,413,181	1,626,693
Reasonably possible changes to unrecognized tax benefits related to settlement of tax audits and/or expiration of statutes of limitations within the next twelve months	12,300		12,300
Deferred tax liability, undistributed foreign earnings	$ 11,900	$ 14,600	11,900	14,600
Decrease of deferred tax liabilities from undistributed foreign earnings			(2,700)
Undistributed foreign U.S GAAP retained earnings not taxed			6,700,000
Undistributed foreign U.S GAAP retained earnings previously taxes under the Tax Act			4,700,000
Accounting Standards Update 2016-16
Income Taxes [Line Items]
Retained earnings (accumulated deficit)						$ 9,400
Foreign
Income Taxes [Line Items]
Increase (decrease) of valuation allowance on deferred tax assets			$ 311,000	$ 75,000