Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2017	Dec. 31, 2015
Income Tax [Line Items]
U.S. federal statutory income tax rate	21.00%	35.00%	35.00%
Reduction in deferred tax assets due to tax cuts and jobs act		$ 420,000
Income tax provisions	$ 148,317	565,599	$ 123,769
Deferred tax assets, valuation allowance	73,114	61,456	$ 69,593		$ 89,251
Deferred tax assets recorded due to net operating losses and tax credit carryforwards	249,509
Indefinite-lived carryforwards	32,000
Other certain tax credit carryforwards	$ 171,000
Certain carryforwards begin to expire	2029
Income tax examination, description	With few exceptions, the Company is no longer subject to income tax examination by foreign tax authorities and by U.S. federal, state and local tax authorities for years prior to 2014. While we are under examination in various tax jurisdictions with respect to certain open years, the Company does not expect that the result of any final determination related to these examinations will have a material impact on its financial statements. Developments with respect to such examinations are monitored on an ongoing basis and adjustments to tax liabilities are made as appropriate.
Unrecognized tax benefits, including interest and penalties recorded that may be recognized within 12 months	$ 13,000
Adjustments for New Accounting Principle [Member]
Income Tax [Line Items]
Income tax provisions	$ 33,000	9,000
Deferred tax assets recorded for previously unrecognized excess tax benefits on share-based payment awards				$ 81,544
Deferred tax assets, valuation allowance		$ 12,090		$ 12,090