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Stockholders' Equity - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 02, 2020 | Mar. 01, 2019 | Mar. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Payment of regular quarterly dividend |  |  |  |  |  | $ 31,189,000 | $ 29,050,000
Regular quarterly dividends paid per share |  |  |  |  |  | $ 0.74 | $ 0.70
Shares issued pursuant to dividend reinvestment, shares |  |  |  |  |  | 13,027 | 23,571
Proceeds from issuance of common stock under the dividend reinvestment plan |  |  |  |  |  | $ 410,000 | $ 718,000
Stock based compensation expense |  |  |  |  |  | $ 1,600,000 | $ 1,139,000
Common Stock [Member] |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Shares issued pursuant to dividend reinvestment, shares |  |  |  | 1,000 | 12,000 | 13,000 | 24,000
2016 ATM Program [Member] | Maximum [Member] |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Aggregate sales price |  |  | $ 125,000,000 |  |  |  |
ATM Program [Member] |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of shares |  |  |  |  |  | $ 11,916,000 | $ 6,663,000
ATM Program [Member] | Common Stock [Member] |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Shares issued pursuant to Offering/Program net, shares |  |  |  | 404,000 | 213,000 | 404,000 | 213,000
Proceeds from issuance of shares |  |  |  | $ 11,916,000 | $ 6,663,000 | $ 11,916,000 | $ 6,663,000
Amended and Restated 2004 Omnibus Incentive Compensation Plan [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Restricted stock units, granted | 176,050 | 156,750 |  |  |  |  |

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