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Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Shareholders Equity [Line Items] |  |  |  |
Beginning balance, value |  |  | $ 553,695,000 |
Net earnings | $ 13,540,000 | $ 15,106,000 | 23,572,000 | $ 24,810,000
Dividends declared — $0.64 per share |  |  | (25,915,000) |
Shares issued pursuant to ATM Program, net |  |  | 13,714,000 |
Shares issued pursuant to dividend reinvestment, value |  |  | $ 755,000 | $ 628,000
Shares issued pursuant to dividend reinvestment, shares |  |  | 28,884 | 24,284
Stock-based compensation, value |  |  | $ 848,000 |
Ending balance, value | 566,669,000 |  | 566,669,000 |
Common Stock [Member] |  |  |  |
Shareholders Equity [Line Items] |  |  |  |
Beginning balance, value |  |  | $ 397,000 |
Beginning balance, shares |  |  | 39,696,000 |
Shares issued pursuant to ATM Program, net |  |  | $ 6,000 |
Shares issued during period, shares |  |  | 537,000 |
Shares issued pursuant to dividend reinvestment, shares |  |  | 29,000 |
Ending balance, value | $ 403,000 |  | $ 403,000 |
Ending balance, share | 40,262,000 |  | 40,262,000 |
Additional Paid-in-Capital [Member] |  |  |  |
Shareholders Equity [Line Items] |  |  |  |
Beginning balance, value |  |  | $ 604,872,000 |
Shares issued pursuant to ATM Program, net |  |  | 13,708,000 |
Shares issued pursuant to dividend reinvestment, value |  |  | 755,000 |
Stock-based compensation, value |  |  | 848,000 |
Ending balance, value | $ 620,183,000 |  | 620,183,000 |
Dividends Paid in Excess of Earnings [Member] |  |  |  |
Shareholders Equity [Line Items] |  |  |  |
Beginning balance, value |  |  | (51,574,000) |
Net earnings |  |  | 23,572,000 |
Dividends declared — $0.64 per share |  |  | (25,915,000) |
Ending balance, value | $ (53,917,000) |  | $ (53,917,000) |

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