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Notes Payable - Schedule of Information Related to Lines of Credit (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Maximum amount outstanding $ 199,471 $ 219,635
Average amount outstanding $ 170,075 $ 201,195
Weighted average interest rate, during the period 2.11% 3.59%
Prime Rate [Member]    
Debt Instrument [Line Items]    
Prime interest rate, end of period 3.25% 4.75%