Income Taxes - Reconciliation of U.S. Statutory Income Tax Rate to Our Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. statutory income tax rate	35.00%	35.00%	35.00%
State taxes, net of federal deduction	1.80%	2.00%	(1.70%)
Tax impact of foreign operations, including U.S. taxes on international income and foreign tax credits	(32.00%)	(11.00%)	(62.30%)
Change in valuation allowance	0.80%		(3.70%)
Non-deductible expenses	2.70%	0.90%	2.40%
Goodwill impairment	22.50%
Tax rate change	(24.00%)
Tax impact of certain significant transactions		1.60%	21.60%
Tax benefit relating to U.S. manufacturer’s deduction	(1.70%)	(4.70%)	(6.20%)
R&D tax credit	(1.20%)	(1.90%)	(4.20%)
Share-based compensation	(2.60%)	(2.90%)	1.10%
Net uncertain tax positions, including interest and penalties	(17.00%)	4.20%	22.90%
U.S. tax reform	(273.80%)
Other	(0.80%)	0.60%	(0.30%)
Effective income tax rate	(290.30%)	23.80%	4.60%