Income Taxes - Schedule of Effective Tax Rates (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Federal provision	35.00%	35.00%	35.00%	35.00%
State provision	6.20%	6.90%	6.20%	6.90%
State benefit	(2.20%)	(2.40%)	(2.20%)	(2.40%)
International benefit	(9.10%)	(4.50%)	(10.10%)	(5.50%)
Permanent items	0.40%	3.20%	0.50%	2.10%
Other	0.10%	0.60%	(1.40%)	0.30%
Effective rate	30.40%	38.80%	28.00%	36.40%