Income Taxes - Schedule of Effective Income Tax Rate Reflected in Provision for Income Taxes and U.S. Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal income tax statutory rate	21.00%	35.00%	35.00%
Foreign income tax rate differential	(0.94%)	2.41%	(11.66%)
Foreign development tax incentive	0.24%	1.78%	(0.93%)
Nondeductible goodwill impairment	(5.21%)	0.00%	0.00%
Exempt income	2.32%	0.00%	0.00%
Foreign inclusions (SubF / GILTI net of FTC)	(2.40%)	(0.00%)	(0.00%)
Transition tax (net of FTC)	5.80%	(28.62%)	0.00%
Nondeductible expenses	(1.03%)	(1.75%)	0.54%
Foreign intellectual property tax benefit	0.00%	16.06%	(1.08%)
Manufacturing benefit	(1.18%)	(0.00%)	(0.99%)
Change in valuation allowance	(1.99%)	(35.61%)	0.00%
Changes to PY Accruals	(1.17%)	(4.01%)	0.48%
Deferred tax rate change	0.66%	(20.66%)	0.00%
Change in Uncertain tax positions	(0.78%)	(25.59%)	0.00%
Interest on net equity	1.02%	3.15%	0.00%
Other	0.44%	4.53%	(1.81%)
Effective tax rate	16.78%	(53.31%)	19.55%