Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Line Items]
Income tax expense	$ 34,818	$ 25,786	$ 57,294	$ 48,353
Effective tax rate for income tax expense	36.50%	36.60%	35.80%	33.40%
U.S. federal statutory rate			35.00%
Valuation allowance amount	$ 33,560		$ 33,560
Liability for uncertain tax positions noncurrent	7,932		7,932
U.S. [Member]
Income Tax Disclosure [Line Items]
Valuation allowance amount	20,635		20,635
Foreign [Member]
Income Tax Disclosure [Line Items]
Valuation allowance amount	$ 12,925		$ 12,925