Income Taxes - Reconciliation of Income Tax Provision to Statutory Federal Tax Rate (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory federal tax rate	35.00%	35.00%	35.00%
State taxes, net of federal taxes	0.60%	1.20%	0.70%
Accounting for historical uncertain tax positions	(0.10%)	1.10%	(0.40%)
Tax rate differential for international jurisdictions and other international related tax items	(12.80%)	(11.60%)	(15.30%)
U.S. tax credits	(2.70%)	(1.90%)	(3.80%)
Change in valuation allowance	0.60%	(2.30%)	0.70%
U.S. domestic production activities deduction	(1.40%)	(1.80%)	(1.50%)
International reorganization of acquired companies	0.00%	0.00%	0.60%
Permanent items	4.30%	3.90%	3.80%
Other	1.10%	(0.50%)	0.20%
Effective income tax rate	24.60%	23.10%	20.00%