Leases (Lessee) - Summary of Lease Expense (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lessee Lease Description [Line Items]
Operating lease cost	[1],[2]	$ 9,910	$ 9,262
Finance lease cost:
Sublease income				$ (4,300)
Total lease cost		7,475	5,952
Real Estate Depreciation and Amortization [Member]
Finance lease cost:
Amortization of right-of-use assets		51	51
Interest [Member]
Finance lease cost:
Interest on lease liabilities		128	117
Other [Member]
Finance lease cost:
Sublease income		$ (2,614)	$ (3,478)

[1] $6.0 million and $5.8 million included in “Property-related”, with the remainder reflected in the “General and administrative” line of our consolidated statements of net income for 2020 and 2019, respectively.

[2] Includes short-term leases.