Income Taxes - Reconciliation of U.S. Statutory Income Tax Rate to Our Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. statutory income tax rate	21.00%	35.00%	35.00%
State taxes, net of federal deduction	(2.50%)	1.80%	2.00%
Tax impact of foreign operations, including U.S. taxes on international income and foreign tax credits	54.30%	(32.00%)	(11.00%)
Change in valuation allowance	(4.90%)	0.80%
Non-deductible expenses	1.70%	2.70%	0.90%
Goodwill impairment	(75.20%)	22.50%
Tax rate change	(12.20%)	(24.00%)
Tax impact of certain significant transactions			1.60%
Tax benefit relating to foreign derived intangible income and U.S. manufacturer’s deduction	(0.20%)	(1.70%)	(4.70%)
R&D tax credit	6.00%	(1.20%)	(1.90%)
Share-based compensation	0.10%	(2.60%)	(2.90%)
Net uncertain tax positions, including interest and penalties	(25.50%)	(17.00%)	4.20%
U.S. tax reform	(3.10%)	(273.80%)
Other	0.60%	(0.80%)	0.60%
Effective income tax rate	(39.90%)	(290.30%)	23.80%