Income Tax - Reconciliation of Total Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of year	$ 9,238	$ 9,148	$ 12,219
Gross increases—tax positions in prior period	0	578	0
Gross decreases—tax positions in prior period	(92)	(488)	0
Lapse of statute of limitations	0	0	(3,071)
Balance, end of year	$ 9,146	$ 9,238	$ 9,148