Summary of Preferred Stock (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Preferred Stock, Shares Authorized	10,000,000us-gaap_PreferredStockSharesAuthorized	10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock Shares Issued	373,355us-gaap_PreferredStockSharesIssued	373,355us-gaap_PreferredStockSharesIssued
Dividends, Preferred Stock, Stock	$ 109,500us-gaap_DividendsPreferredStockStock	$ 0us-gaap_DividendsPreferredStockStock
Preferred Stock, Shares Outstanding	373,355us-gaap_PreferredStockSharesOutstanding	373,355us-gaap_PreferredStockSharesOutstanding
Series A Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized	590,197	590,197
Preferred Stock Shares Issued	47,250	47,250
Dividends, Preferred Stock, Stock	0	0
Preferred Stock, Shares Outstanding	47,250	47,250
Series B Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized	1,500,000	1,500,000
Preferred Stock Shares Issued	93,750	93,750
Dividends, Preferred Stock, Stock	28,125	0
Preferred Stock, Shares Outstanding	93,750	93,750
Series C Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized	1,666,666	1,666,666
Preferred Stock Shares Issued	38,333	38,333
Dividends, Preferred Stock, Stock	8,625	0
Preferred Stock, Shares Outstanding	38,333	38,333
Series D Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized	300,000	300,000
Preferred Stock Shares Issued	175,000	175,000
Dividends, Preferred Stock, Stock	41,250	0
Preferred Stock, Shares Outstanding	175,000	175,000
Series E Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized	800,000	800,000
Preferred Stock Shares Issued	19,022	19,022
Dividends, Preferred Stock, Stock	31,500	0
Preferred Stock, Shares Outstanding	19,022	19,022
Undesignated Preferred Series [Member]
Preferred Stock, Shares Authorized	5,143,137	5,143,137
Preferred Stock Shares Issued	0	0
Dividends, Preferred Stock, Stock	$ 0	$ 0
Preferred Stock, Shares Outstanding	0	0

Amount of paid and unpaid preferred stock dividends declared with the form of settlement in stock.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 405

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

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- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ 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

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- Definition

Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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- Definition

Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

+ References

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