Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Line Items]
Rent expense	$ 45,400,000	$ 40,000,000.0	$ 38,800,000
Other invested assets	$ 465,153,000	$ 573,605,000
Maximum
Commitments and Contingencies Disclosure [Line Items]
Non-cancelable operating leases, expiration date	2040
Hotel Development Projects
Commitments and Contingencies Disclosure [Line Items]
Other invested assets	$ 800,000
Hotel Development Projects | Maximum
Commitments and Contingencies Disclosure [Line Items]
Guaranteed debt of entities	$ 5,300,000