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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Shareholders Equity [Line Items]        
Beginning balance, value $ 680,543 $ 586,475 $ 659,601 $ 589,439
Net earnings 12,890 10,973 30,817 23,673
Dividends declared (17,785) (15,768) (35,475) (31,400)
Shares issued pursuant to dividend reinvestment, value 18 16 $ 36 $ 410
Shares issued pursuant to dividend reinvestment, shares     1,258 13,027
Stock-based compensation/settlements, value 788 868 $ 1,209 $ 1,356
Ending balance, value 685,766 594,508 685,766 594,508
Cumulative Effect Adjustment for Adoption of New Accounting Pronouncement [Member]        
Shareholders Equity [Line Items]        
Beginning balance, value       (886)
ATM Program [Member]        
Shareholders Equity [Line Items]        
Shares issued pursuant to ATM Program, net, value 9,312 11,944 29,578 11,916
Common Stock [Member]        
Shareholders Equity [Line Items]        
Beginning balance, value $ 444 $ 414 $ 436 $ 414
Beginning balance, shares 44,367,000 41,391,000 43,606,000 41,368,000
Shares issued pursuant to dividend reinvestment, shares   1,000 1,000 13,000
Stock-based compensation/settlements, value $ 1   $ 1  
Stock-based compensation/settlements, shares 47,000   64,000 11,000
Ending balance, value $ 447 $ 418 $ 447 $ 418
Ending balance, share 44,703,000 41,796,000 44,703,000 41,796,000
Common Stock [Member] | ATM Program [Member]        
Shareholders Equity [Line Items]        
Shares issued pursuant to ATM Program, net, value $ 2 $ 4 $ 10 $ 4
Shares issued pursuant to ATM Program, net, shares 289,000 404,000 1,032,000 404,000
Additional Paid-in-Capital [Member]        
Shareholders Equity [Line Items]        
Beginning balance, value $ 743,305 $ 656,981 $ 722,608 $ 656,127
Shares issued pursuant to dividend reinvestment, value 18 16 36 410
Stock-based compensation/settlements, value 787 868 1,208 1,356
Ending balance, value 753,420 669,805 753,420 669,805
Additional Paid-in-Capital [Member] | ATM Program [Member]        
Shareholders Equity [Line Items]        
Shares issued pursuant to ATM Program, net, value 9,310 11,940 29,568 11,912
Dividends Paid in Excess of Earnings [Member]        
Shareholders Equity [Line Items]        
Beginning balance, value (63,206) (70,920) (63,443) (67,102)
Net earnings 12,890 10,973 30,817 23,673
Dividends declared (17,785) (15,768) (35,475) (31,400)
Ending balance, value $ (68,101) $ (75,715) $ (68,101) (75,715)
Dividends Paid in Excess of Earnings [Member] | Cumulative Effect Adjustment for Adoption of New Accounting Pronouncement [Member]        
Shareholders Equity [Line Items]        
Beginning balance, value       $ (886)