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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)

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