Income Taxes - Schedule of Effective Income Tax Rate Computed Using Income before Income Taxes and Applying U.S. Federal Income Tax Rate (Details)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income tax provision
Tax at U.S. federal income tax rate		35.00%	35.00%	35.00%
State income taxes, net of federal benefit(1)	[1]	2.60%	2.10%	2.80%
Effect of foreign operations		(3.50%)	(5.30%)	(2.50%)
Non-deductible expenses		(1.30%)	0.30%	(1.40%)
Effective tax rate attributable to controlling interests		32.80%	32.10%	33.90%
Parent
Income tax provision
Effective tax rate attributable to controlling interests	[2]	32.80%	32.10%	33.90%
Total effective income tax rate		23.60%	22.50%	22.50%
Non-Controlling Interests
Income tax provision
Effect of income from non-controlling interests		(9.20%)	(9.60%)	(11.40%)

[1] State income taxes included changes related to state valuation allowances.

[2] Taxes attributable to the controlling interest divided by Income before income taxes (controlling interest).