Income Taxes - Reconciliation of the U.S. Federal Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory rate	(21.00%)	(21.00%)	(35.00%)
State tax provisions, net of federal income tax benefit	(2.70%)	6.40%	263.40%
Tax credits	(6.60%)	1.30%	88.90%
Foreign income taxes at rates other than the statutory rate	(17.70%)	16.80%	1206.60%
Valuation allowance and other	6.90%	(28.00%)	(138.00%)
Changes in tax liabilities, net	0.30%	(0.60%)	(11.30%)
Share based compensation	1.80%	(1.00%)	(61.50%)
Transaction costs			(372.20%)
US Tax Reform implementation		10.90%	(1918.70%)
US tax on non-US income	6.70%	(16.10%)
Non taxable income	(2.40%)	16.30%	152.60%
Impairment of goodwill	34.00%
Other	4.40%	(4.50%)	31.30%
Effective income tax rate	3.70%	(19.50%)	(793.90%)