Summary of Lease Costs Recognized Under Topic 842 and Other Information Pertaining to Operating Leases (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Lease cost
Operating lease cost	$ 10,335
Variable lease cost	3,967
Total lease cost	14,302
Other information
Operating lease payments	$ 10,416
Weighted average remaining lease term	5 years 6 months
Weighted average discount rate	7.50%