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Income Taxes - Differences Between Income Taxes Using Federal Statutory Income Tax Rate and Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate	21.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	1.30%	1.40%	2.10%
U.S. tax on foreign earnings	4.10%	1.50%	0.20%
Impact of U.S. Tax Cuts and Jobs Act (“TCJA”)	2.10%	23.10%	0.00%
Impact of differences in foreign tax rates	(6.70%)	(18.00%)	(6.30%)
effective income tax rate impact on expiration of statute of limitations	(6.20%)	0.00%	0.00%
Valuation allowance release for Israel	0.00%	0.00%	(12.90%)
Stock-based compensation	(3.40%)	(6.30%)	1.20%
Other items not individually material	0.20%	(1.00%)	1.80%
Effective Income Tax Rate, Continuing Operations, Total	12.40%	35.70%	21.10%

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