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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]    
Combined federal, state and foreign income tax rate 29.00% (17.00%)
Statutory rate applied to income before income taxes 35.00% 35.00%
Effective income tax rate reconciliation, noncontrolling interest income (loss), percent   51.00%
Unrecognized benefits $ 10