Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Investment in Joint Ventures - Company's Share of Unconsolidated Joint Ventures' Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]        
Income (loss) from equity method investments $ 970 $ 1,110 $ 2,086 $ 1,921
Sovran HHF Storage Holdings LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Income (loss) from equity method investments 861 880 1,783 1,709
Sovran HHF Storage Holdings II LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Income (loss) from equity method investments 446 477 901 890
Other Unconsolidated Joint Ventures [Member]        
Schedule of Equity Method Investments [Line Items]        
Income (loss) from equity method investments $ (337) $ (247) $ (598) $ (678)