Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Right-of-use assets related to operating leases	$ 1,100
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets [Member]
Liabilities	$ 637,329	$ 621,253
Other Liabilities [Member]
Liabilities	$ 1,100