Annual report pursuant to Section 13 and 15(d)

Investment in Joint Ventures - Company's Share of Unconsolidated Joint Ventures' Income (Loss) (Detail)

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Investment in Joint Ventures - Company's Share of Unconsolidated Joint Ventures' Income (Loss) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]      
Income (loss) from equity method investments $ 5,696 $ 4,838 $ 4,566
Sovran HHF Storage Holdings LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Income (loss) from equity method investments 3,270 3,743 3,747
Sovran HHF Storage Holdings II LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Income (loss) from equity method investments 1,627 1,884 1,870
Other Unconsolidated Joint Ventures [Member]      
Schedule of Equity Method Investments [Line Items]      
Income (loss) from equity method investments $ 799 $ (789) $ (1,051)