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Investments in and Advances to Unconsolidated Affiliates - Schedule of Share of Net Income (Loss) From Unconsolidated Affiliates (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Equity Method Investments And Joint Ventures [Abstract]        
Income from unconsolidated affiliates $ 20,635 $ 36,214 $ 48,030 $ 101,967
Non-operating items from unconsolidated affiliates (23,604) (14,669) (79,986) (54,311)
Net income from unconsolidated affiliates $ (2,969) $ 21,545 $ (31,956) $ 47,656