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Preferred Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 02, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2018
Auction Market Preferred Securities, Stock Series [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, shares authorized (shares) |  |  |  |  |  |  |  |  | 10,000,000
Preferred Stock, par value per share (usd per share) |  |  |  |  |  |  |  | $ 0.01 | $ 0.01
Shares redeemed |  |  |  |  |  |  |  | $ 138.4 |
Stock issuance costs |  |  |  |  |  |  |  | $ 0.8 |
Distribution Amount Per Share (usd per share) | $ 0.421875 | $ 0.421875 | $ 0.421875 | $ 0.421875 | $ 0.421875 | $ 0.421875 | $ 0.421875 |  |
Redeemable Perpetual Preferred Stock |  |  |  |  |  |  |  |  |
Auction Market Preferred Securities, Stock Series [Line Items] |  |  |  |  |  |  |  |  |
Dividend rate (percentage) |  |  |  |  |  |  |  | 6.75% |

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- Definition The number of preferred shares that are available for issue by the board of directors without further shareholder approval. + References No definition available. + Details
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- Definition Stock Repurchase, Issuance Expense + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The cash outflow for reacquisition of callable preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
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- Definition Aggregate dividends paid during the period for each share of preferred stock outstanding. + References No definition available. + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: 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 + Details
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- Details
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