Commitments and Contingencies - Additional Information (Detail) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Line Items]
Other invested assets	$ 445,828,000	$ 573,605,000
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

Amount of investments classified as other.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f,g))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_OtherInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant