Income Taxes - Reconciliation of the Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 4,718	$ 2,650	$ 29
Additions attributable to state and local apportionment	2,113	2,068	2,650
Reductions for tax positions of prior years			(29)
Balance at end of year	$ 6,831	$ 4,718	$ 2,650