Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax benefit	$ 3,122	$ (2,230)	$ 10,416	$ (5,417)
Unrecognized tax benefits	900		900		$ 900
Accrued unrecognized tax benefits interest and penalties	$ 400		$ 400		$ 400