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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Loss Carryforwards [Line Items]
U.S. federal income tax rate				21.00%
Tax reform adjustments to provision for income taxes		$ 0
Provision (benefit) for income taxes	$ (5,733,000)		$ 4,324,000	$ (5,333,000)	$ 3,402,000
Percentage of provision on pre-tax loss				3.00%	11.00%
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Portion of state deferred tax assets, not able to be utilized	$ 3,500,000			$ 3,500,000
Federal [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets valuation allowance				$ 8,400,000

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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