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Equity Method Investments - Reconciliation of Net Income to Equity in Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]                      
Equity income based on stated ownership percentages $ 27,266       $ 28,272       $ 27,266 $ 28,272 $ 30,787
Timing of GAAP and other adjustments (114)       652       (114) 652 (444)
Equity in income of investees $ 7,905 $ 8,271 $ 4,913 $ 6,063 $ 6,506 $ 7,874 $ 6,862 $ 7,682 $ 27,152 $ 28,924 $ 30,343