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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating Loss Carryforwards [Line Items]
U.S. federal income tax rate			21.00%
Valuation allowance on federal deferred tax assets	$ 11,000		$ 11,000
Provision (benefit) for income taxes	4,324	$ (2,761)	$ 3,402	$ (4,043)
Percentage of provision (benefit) on pre-tax loss			11.00%	(24.00%)
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Portion of state deferred tax assets, not able to be utilized before expiration	$ 5,100		$ 5,100

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Deferred tax assets not able to be utilized before expiration.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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