Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate	21.00%	35.00%	35.00%
State taxes, net of U.S. federal benefit	1.20%	(1.20%)	4.80%
Foreign rate differential	(1.10%)	(6.70%)	(13.20%)
Foreign operations	8.30%	(0.10%)	2.40%
Valuation allowance	(3.70%)	0.80%	11.20%
Changes in uncertain tax positions	0.00%	5.10%	(0.10%)
Effect of law changes	0.00%	(70.20%)	(12.30%)
Stock-based compensation	(3.80%)	(3.30%)	(4.70%)
Other	(0.30%)	2.40%	(2.20%)
Effective tax rate	21.60%	(38.20%)	20.90%