Risk Management and Derivative Instruments - Interest Rate Swap Open Positions (Detail) $ in Thousands	6 Months Ended
Jun. 30, 2021 USD ($)
Interest Rate Swap Open Position Remaining 2021 [Member]
Derivative [Line Items]
Average Monthly Notional (in thousands)	$ 125,000
Weighted-average fixed rate	1.612%
Floating rate	0
Interest Rate Swap Open Position 2022 [Member]
Derivative [Line Items]
Average Monthly Notional (in thousands)	$ 75,000
Weighted-average fixed rate	1.281%
Floating rate	0

Nominal or face amount used to calculate payment on derivative.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant