Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Line Items]
Income tax expense	$ 26,740	$ 17,845	$ 75,093	$ 65,104
Effective tax rate for income tax expense	32.50%	44.70%	33.00%	32.90%
U.S. federal statutory rate			35.00%
Discrete tax expense	298	8,389	400	8,292
Valuation allowance amount	31,979		31,979
Liability for uncertain tax positions noncurrent	6,764		6,764
U.S. [Member]
Income Tax Disclosure [Line Items]
Valuation allowance amount	22,072		22,072
Foreign [Member]
Income Tax Disclosure [Line Items]
Valuation allowance amount	$ 9,907		$ 9,907