COVID-19 - (Additional Information) (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
Jan. 31, 2021	Mar. 31, 2020
Accounting Changes And Error Corrections [Abstract]
Increase in credit losses		$ 0.6
Net proceeds from sale of convertible unsecured subordinated debentures	$ 29.5

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

Name:	us-gaap_ProceedsFromConvertibleDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration