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Preferred Shares - Additional information (Detail) - USD ($) $ / shares in Units, $ in Thousands | Feb. 15, 2014 | Dec. 19, 2013 | Dec. 31, 2018 | Dec. 31, 2017
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Preferred Stock [Line Items] |  |  |  |
Preferred shares, liquidation preference |  |  | $ 1,000 | $ 1,000
Depositary Shares [Member] |  |  |  |
Preferred Stock [Line Items] |  |  |  |
Newly issued shares |  | 1,000,000 |  |
Percentage of ownership Interest |  | 6.50% |  |
Share issued price per share |  | $ 25.00 |  |
Gross proceeds from public offering |  | $ 25,000 |  |
Shares outstanding |  |  | 404,818 |
Series B Preferred Stock [Member] |  |  |  |
Preferred Stock [Line Items] |  |  |  |
Preferred shares, liquidation preference |  | $ 1,000 |  |
Dividend on preferred stock |  | 6.50% |  |
Series A Preferred Stock [Member] |  |  |  |
Preferred Stock [Line Items] |  |  |  |
Aggregate purchase price of Preferred stock | $ 22,857 |  |  |
Preferred stock redemption date | Feb. 15, 2014 |  |  |

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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