Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax benefit (expense)	$ (768)	$ 2,150	$ 267	$ 2,848
Deferred tax valuation allowance	$ 10,900		$ 10,900		$ 10,700