Annual report pursuant to Section 13 and 15(d)

Borrowings - Summary of Borrowings (Detail)

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Borrowings - Summary of Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total borrowings, gross $ 671,573  
Debt issuance costs – notes and bonds payable (3,700)  
Total borrowings, net 667,982 $ 624,061
Notes and bonds payable, net    
Debt Instrument [Line Items]    
Total borrowings, gross 671,573 627,590
Debt issuance costs – notes and bonds payable (3,691) (3,629)
Total borrowings, net 667,882 623,961
Notes payable to bank | Fixed-rate notes payable    
Debt Instrument [Line Items]    
Total borrowings, gross $ 583,807 492,182
Notes payable to bank | Fixed-rate notes payable | Minimum    
Debt Instrument [Line Items]    
Stated Interest Rate 2.44%  
Notes payable to bank | Fixed-rate notes payable | Maximum    
Debt Instrument [Line Items]    
Stated Interest Rate 5.70%  
Notes payable to bank | Fixed-rate notes payable | Weighted average    
Debt Instrument [Line Items]    
Stated Interest Rate 3.73%  
Notes payable to bank | Variable-rate notes payable    
Debt Instrument [Line Items]    
Total borrowings, gross $ 1,714 45,525
Notes payable to bank | Variable-rate notes payable | Minimum    
Debt Instrument [Line Items]    
Stated Interest Rate 3.00%  
Notes payable to bank | Variable-rate notes payable | Maximum    
Debt Instrument [Line Items]    
Stated Interest Rate 3.00%  
Notes payable to bank | Variable-rate notes payable | Weighted average    
Debt Instrument [Line Items]    
Stated Interest Rate 3.00%  
Bonds payable | Fixed-rate bonds payable    
Debt Instrument [Line Items]    
Total borrowings, gross $ 86,052 89,883
Bonds payable | Fixed-rate bonds payable | Minimum    
Debt Instrument [Line Items]    
Stated Interest Rate 2.13%  
Bonds payable | Fixed-rate bonds payable | Maximum    
Debt Instrument [Line Items]    
Stated Interest Rate 4.57%  
Bonds payable | Fixed-rate bonds payable | Weighted average    
Debt Instrument [Line Items]    
Stated Interest Rate 3.45%  
Line of credit | Fixed-rate bonds payable | Revolving credit facility    
Debt Instrument [Line Items]    
Stated Interest Rate 2.50%  
Line of credit | Variable-rate revolving lines of credit | Revolving credit facility    
Debt Instrument [Line Items]    
Total borrowings, net $ 100 $ 100