Income Taxes - Schedule of Effective Tax Rates (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Federal provision	35.00%	35.00%	35.00%	35.00%
State provision	5.80%	5.20%	5.80%	5.20%
State benefit	(2.00%)	(1.80%)	(2.00%)	(1.80%)
Changes in state apportionment	0.00%	(4.00%)	0.00%	(1.70%)
Tax reserves	0.00%	1.80%	0.00%	0.70%
International benefit	(8.70%)	(4.80%)	(5.00%)	(2.00%)
Permanent items	5.70%	1.10%	4.10%	1.30%
Other	(10.60%)	0.00%	(4.00%)	0.00%
Effective rate	25.20%	32.50%	33.90%	36.70%