Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Lines of Credit - Composition of Partnership's Aggregate Bank Lines of Credit (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Sep. 28, 2018
Line Of Credit Facility [Line Items]
Line of credit facility	$ 890,000,000	$ 890,000,000
2018 Credit Facility [Member]
Line Of Credit Facility [Line Items]
Line of credit facility	500,000,000	500,000,000	$ 500,000,000
Uncommitted Secured Credit Facilities [Member]
Line Of Credit Facility [Line Items]
Line of credit facility	$ 390,000,000	$ 390,000,000