Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	[1]
Income Taxes [Line Items]
Annual effective tax rate				35.00%	36.90%
Deferred tax assets valuation allowance	$ 2,000			$ 2,000
Tax benefit from tax rate changes	927
(Benefit) provision for income taxes	(4,721)	$ (2,235)		(6,981)	$ (2,452)
Additional paid-in-capital	$ 305,389			$ 305,389		$ 266,705
Accounting Standards Update 2013-11
Income Taxes [Line Items]
Unrecognized tax benefits			$ 6,300
(Benefit) provision for income taxes			3,700
Valuation allowance (decrease) increase			2,600
Additional paid-in-capital		$ 6,300	$ 6,300		$ 6,300

[1] Derived from audited consolidated financial statements.