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Stockholders' Equity - Summary of Pro-Forma Adjustments to Consolidated Balance Sheet (Parenthetical) (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Condensed Balance Sheet Statements Captions [Line Items] |  |
Cumulative convertible preferred stock, par value | $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Common stock, par value | $ 0.01us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Pro-Forma [Member] |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |
Cumulative convertible preferred stock, par value | $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember |
Common stock, par value | $ 0.01us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + 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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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