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Shareholders' Equity - Additional Information (Detail) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2018 shares | Jul. 10, 2017 USD ($) Offering shares | Mar. 31, 2018 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | May 08, 2018 shares | Dec. 31, 2017 $ / shares shares | Oct. 25, 2017 shares | Oct. 24, 2017 $ / shares shares
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  | 20,000,000 |  | 20,000,000 |  | 20,000,000 | 10,000,000 | 10,000,000 | 10,000,000
Preferred stock, par value | $ / shares |  |  |  |  | $ 0.01 |  | $ 0.01 |  |  | $ 0.01 |  | $ 0.01
Authorized but unissued preferred stock reclassified to common stock |  |  |  |  |  |  |  |  |  |  |  | 10,000,000
Common stock, par value | $ / shares |  |  |  |  | $ 0.01 |  | $ 0.01 |  |  | $ 0.01 |  | $ 0.01
Shares authorized |  |  |  |  |  |  |  |  | 120,000,000 |  | 70,000,000 |
Common stock, shares authorized |  |  |  |  | 100,000,000 |  | 100,000,000 |  | 100,000,000 | 60,000,000 | 60,000,000 |
Proceeds from issuance of shares | $ |  |  |  |  |  |  | $ 13,714,000 | $ 5,860,000 |  |  |  |
Payment of regular quarterly dividend | $ |  |  |  |  |  |  | $ 25,736,000 | $ 19,569,000 |  |  |  |
Regular quarterly dividends paid per share | $ / shares |  |  |  |  |  |  | $ 0.64 | $ 0.56 |  |  |  |
Shares issued pursuant to dividend reinvestment, shares |  |  |  |  |  |  | 28,884 | 24,284 |  |  |  |
Shares issued pursuant to dividend reinvestment, value | $ |  |  |  |  |  |  | $ 755,000 | $ 628,000 |  |  |  |
Stock based compensation expenses | $ |  |  |  |  |  |  | $ 848,000 | 655,000 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total shares issued |  |  |  |  |  |  | 537,000 |  |  |  |  |
Shares issued pursuant to dividend reinvestment, shares |  |  |  |  |  |  | 29,000 |  |  |  |  |
2016 ATM Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of shares | $ |  |  |  |  |  | $ 1,580,000 |  | $ 5,860,000 |  |  |  |
Total shares issued |  |  |  |  |  | 64,000 |  | 232,000 |  |  |  |
2016 ATM Program [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate sales price | $ |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |
ATM Program [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate sales price | $ |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |
ATM Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of shares | $ |  |  |  |  | $ 13,714,000 |  | $ 13,714,000 |  |  |  |  |
Total shares issued |  |  |  |  | 537,000 |  | 537,000 |  |  |  |  |
Underwriting Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number Of Equity Offering Completed | Offering |  | 1 |  |  |  |  |  |  |  |  |  |
Number of shares of common stock the Company sold to the underwriters pursuant to the underwriting agreement |  | 4,100,000 |  |  |  |  |  |  |  |  |  |
Period granted to underwriter for purchase of additional shares |  | 30 days |  |  |  |  |  |  |  |  |  |
Common stock offering underwriting agreement additional shares granted |  | 615,000 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of shares | $ |  | $ 104,312,000 |  |  |  |  |  |  |  |  |  |
Amended and Restated 2004 Omnibus Incentive Compensation Plan [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units, granted | 121,650 |  |  |  |  |  |  |  |  |  |  |

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