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Variable Interests (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
Sep. 30, 2020
joint_venture
Sep. 30, 2020
USD ($)
joint_venture
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
subsidiary
Variable Interest Entity [Line Items]            
Number of wholly-owned unconsolidated subsidiaries | subsidiary           3
Repayments of debt     $ 0 $ 30,928    
Number of interests in consolidated VIE joint ventures | joint_venture   0 0      
Notes payable to Trusts | Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Repayments of debt $ 30,928       $ 88,662  
Notes payable to Trusts         $ 30,928