Leases Schedule of Lease Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Lease liability cost	$ 22,507
Variable lease cost not included in the lease liability	3,754
Total lease cost	$ 26,261	$ 21,300	$ 18,400