Shareholders' Equity - Summary of Company's Board of Directors Approved and Declared a Quarterly Preferred Cash Dividend (Parenthetical) (Detail)	9 Months Ended
Sep. 30, 2021
Series B Preferred Shares
Class Of Stock [Line Items]
Dividends payment commencement date	Dec. 15, 2021

Date the dividend to be paid was declared, in YYYY-MM-DD format.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586

Name:	us-gaap_DividendsPayableDateDeclaredDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration