Income Taxes - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014	Sep. 30, 2015 USD ($) tax_audit	Sep. 30, 2014	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Income Tax Disclosure [Line Items]
Effective income tax rates	34.60%	37.60%	34.00%	36.60%
Tax benefit					$ 1,300,000
Unrecognized income tax benefit	$ 700,000		$ 700,000			$ 700,000
Interest and penalties accrued for income tax	900,000		900,000			$ 900,000
Minimum [Member]
Income Tax Disclosure [Line Items]
Change in uncertain tax positions	0		0
Maximum [Member]
Income Tax Disclosure [Line Items]
Change in uncertain tax positions	$ 700,000		$ 700,000
Federal [Member]
Income Tax Disclosure [Line Items]
Statute of limitations			3 years
State [Member]
Income Tax Disclosure [Line Items]
Number of income tax audits in process | tax_audit			1
State [Member] | Minimum [Member]
Income Tax Disclosure [Line Items]
Statute of limitations			3 years
State [Member] | Maximum [Member]
Income Tax Disclosure [Line Items]
Statute of limitations			5 years
Foreign [Member] | Minimum [Member]
Income Tax Disclosure [Line Items]
Statute of limitations			1 year
Foreign [Member] | Maximum [Member]
Income Tax Disclosure [Line Items]
Statute of limitations			7 years