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Senior Secured Notes - Additional Information (Detail) (USD $) | 12 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended | 0 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Jul. 11, 2012 | Jul. 31, 2012 12% Senior Secured Notes Due July 2017 [Member] | Jul. 11, 2012 12% Senior Secured Notes Due July 2017 [Member] | Jul. 31, 2012 Convertible Subordinated Notes [Member] | Dec. 31, 2013 12% Senior Secured Notes Due July 2017 [Member] | Dec. 31, 2013 Jul 1, 2015 through June 30, 2017 [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Senior secured notes, issued | $ 125,000,000 | $ 125,000,000 |  |  | $ 125,000,000 |  |  |
Maturity date of senior secured notes |  |  |  | Jul. 15, 2017 |  |  | Jul. 15, 2017 |
Retirement of convertible subordinated notes |  |  |  |  |  | 42,500,000 |  |
Interest rate | 12.00% |  |  |  | 12.00% |  | 12.00% |
Issuance costs |  |  |  | 4,500,000 |  |  |  |
Convertible subordinated notes remaining |  |  | 172,400,000 |  |  |  |  |
Maturity date of convertible subordinated notes | Sep. 28, 2012 |  |  |  |  |  |  |
Restricted Cash | 25,000,000 | 25,000,000 | 25,000,000 |  |  |  |  |
Minimum Cash Requirement (Jul 1, 2015 through June 30, 2017) |  |  |  |  |  |  |  | 25,000,000
Percentage of repurchase of notes on principal amount of notes | 101.00% |  |  |  |  |  |  |
Percentage of repurchase of notes on principal amount of notes | 100.00% |  |  |  |  |  |  |
Senior Secured Notes carrying amount |  |  |  |  |  |  | $ 125,000,000 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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