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Income Taxes - Schedule of effective tax rate reconciliation (Details)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Tax at U.S. federal income tax rate 35.00% 35.00% 35.00%
State income taxes, net of federal benefit 2.80% 3.50% 1.40%
Non-deductible expenses 0.30% 0.70% 0.50%
Valuation allowance (0.30%) (4.70%) (0.10%)
Effect of foreign operations (2.30%) (2.90%) 0.00%
Foreign basis differences (0.20%) (0.40%) (0.90%)
Effect of changes in tax law, rates (1.40%) (2.00%) (2.10%)
Effect of income from non-controlling interests (11.40%) (12.20%) (13.20%)
Total effective income tax rate 22.50% 17.00% 20.60%