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Income Taxes - Difference Between the Effective Tax Rate and the U.S. Federal Statutory Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax expense at the U.S. federal tax rate	21.00%	35.00%	35.00%
Foreign income tax differential	2.10%	(22.60%)	(14.00%)
U.S. tax on foreign earnings	2.00%	4.30%	0.90%
State and local income taxes	(25.00%)	(11.00%)	0.20%
U.S. permanent book/tax differences	(2.70%)	(1.50%)	1.30%
U.S. research and development tax credits	(29.50%)	(11.20%)	(1.60%)
Change in valuation allowance	27.70%	10.00%	0.80%
U.S. manufacturing deduction permanent difference	0.00%	(8.00%)	(3.50%)
Goodwill impairment	0.00%	0.00%	8.90%
Tax impact of sale of marketing applications business	0.00%	0.00%	9.90%
Tax impact of equity compensation	(1.40%)	0.70%	2.40%
Tax impact of U.S. tax law change - IRC Section 987	0.00%	0.00%	3.50%
Deferred tax impact from U.S. rate change from Tax Reform	0.00%	(27.00%)	0.00%
Tax impact of U.S. Tax Reform/ Transition Tax	(23.90%)	250.00%	0.00%
Tax Impact of uncertain tax positions	20.20%	(3.60%)	(0.60%)
Other, net	(1.60%)	0.40%	0.20%
Effective income tax rate	(11.10%)	215.50%	43.40%

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