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Income Taxes - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Income Tax Disclosure [Abstract]      
Effective Income Tax Rate Reconciliation, Percent 38.00% 35.00% 37.00%
Benefit for noncontrolling interests   1.00% 1.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount     2.00%