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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Shareholders Equity [Line Items] |  |  |  |
Beginning balance, value | $ 586,475 | $ 578,235 | $ 589,439 | $ 581,164
Net earnings | 10,973 | 13,198 | 23,673 | 24,125
Dividends declared | (15,768) | (14,628) | (31,400) | (29,183)
Shares issued pursuant to dividend reinvestment, value | 16 | 361 | $ 410 | $ 718
Shares issued pursuant to dividend reinvestment, shares |  |  | 13,027 | 23,571
Stock-based compensation/settlements, value | 868 | 665 | $ 1,356 | $ 1,024
Ending balance, value | 594,508 | 584,511 | 594,508 | 584,511
ATM Program [Member] |  |  |  |
Shareholders Equity [Line Items] |  |  |  |
Shares issued pursuant to ATM Program, net, value | 11,944 | 6,680 | 11,916 | 6,663
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
Shareholders Equity [Line Items] |  |  |  |
Beginning balance, value |  |  | (886) |
Common Stock [Member] |  |  |  |
Shareholders Equity [Line Items] |  |  |  |
Beginning balance, value | $ 414 | $ 409 | $ 414 | $ 409
Beginning balance, shares | 41,391,000 | 40,883,000 | 41,368,000 | 40,855,000
Shares issued pursuant to dividend reinvestment, shares | 1,000 | 12,000 | 13,000 | 24,000
Stock-based compensation/settlements, shares |  |  | 11,000 | 16,000
Ending balance, value | $ 418 | $ 411 | $ 418 | $ 411
Ending balance, share | 41,796,000 | 41,108,000 | 41,796,000 | 41,108,000
Common Stock [Member] | ATM Program [Member] |  |  |  |
Shareholders Equity [Line Items] |  |  |  |
Shares issued pursuant to ATM Program, net, value | $ 4 | $ 2 | $ 4 | $ 2
Shares issued pursuant to ATM Program, net, shares | 404,000 | 213,000 | 404,000 | 213,000
Additional Paid-in-Capital [Member] |  |  |  |
Shareholders Equity [Line Items] |  |  |  |
Beginning balance, value | $ 656,981 | $ 638,877 | $ 656,127 | $ 638,178
Shares issued pursuant to dividend reinvestment, value | 16 | 361 | 410 | 718
Stock-based compensation/settlements, value | 868 | 665 | 1,356 | 1,024
Ending balance, value | 669,805 | 646,581 | 669,805 | 646,581
Additional Paid-in-Capital [Member] | ATM Program [Member] |  |  |  |
Shareholders Equity [Line Items] |  |  |  |
Shares issued pursuant to ATM Program, net, value | 11,940 | 6,678 | 11,912 | 6,661
Dividends Paid in Excess of Earnings [Member] |  |  |  |
Shareholders Equity [Line Items] |  |  |  |
Beginning balance, value | (70,920) | (61,051) | (67,102) | (57,423)
Net earnings | 10,973 | 13,198 | 23,673 | 24,125
Dividends declared | (15,768) | (14,628) | (31,400) | (29,183)
Ending balance, value | $ (75,715) | $ (62,481) | (75,715) | $ (62,481)
Dividends Paid in Excess of Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
Shareholders Equity [Line Items] |  |  |  |
Beginning balance, value |  |  | $ (886) |

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