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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Shareholders Equity [Line Items]    
Beginning balance, value $ 589,439 $ 581,164
Net earnings 12,700 10,927
Cumulative-effect adjustment for the adoption of new accounting pronouncement (Note 2) (886)  
Dividends declared (15,632) (14,555)
Shares issued pursuant to dividend reinvestment, value $ 394 $ 357
Shares issued pursuant to dividend reinvestment, shares 12,309 12,363
Stock-based compensation/settlements, value $ 487 $ 359
Ending balance, value 586,475 578,235
ATM Program [Member]    
Shareholders Equity [Line Items]    
Shares issued pursuant to ATM Program, net, value (27) (17)
Common Stock [Member]    
Shareholders Equity [Line Items]    
Beginning balance, value $ 414 $ 409
Beginning balance, shares 41,368,000 40,855,000
Shares issued pursuant to dividend reinvestment, shares 12,000 12,000
Stock-based compensation/settlements, shares 11,000 16,000
Ending balance, value $ 414 $ 409
Ending balance, share 41,391,000 40,883,000
Common Stock [Member] | ATM Program [Member]    
Shareholders Equity [Line Items]    
Shares issued pursuant to ATM Program, net, shares 0 0
Additional Paid-in-Capital [Member]    
Shareholders Equity [Line Items]    
Beginning balance, value $ 656,127 $ 638,178
Shares issued pursuant to dividend reinvestment, value 394 357
Stock-based compensation/settlements, value 487 359
Ending balance, value 656,981 638,877
Additional Paid-in-Capital [Member] | ATM Program [Member]    
Shareholders Equity [Line Items]    
Shares issued pursuant to ATM Program, net, value (27) (17)
Dividends Paid in Excess of Earnings [Member]    
Shareholders Equity [Line Items]    
Beginning balance, value (67,102) (57,423)
Net earnings 12,700 10,927
Cumulative-effect adjustment for the adoption of new accounting pronouncement (Note 2) (886)  
Dividends declared (15,632) (14,555)
Ending balance, value $ (70,920) $ (61,051)