Insurance Operations - Assets Held by Insurance Regulators (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalents [Member]
Statutory Accounting Practices [Line Items]
Assets held by insurance regulators	$ 2,635	$ 2,635
Investments [Member]
Statutory Accounting Practices [Line Items]
Assets held by insurance regulators	$ 3,550	$ 3,419

Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 825
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=75763970&loc=SL75763979-209797

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