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Issuance of Notes Payable and Warrants - Additional Information (Detail) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified |  |  | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended
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Sep. 30, 2013 Class A [Member] | Dec. 31, 2012 Class A [Member] | Sep. 30, 2013 Class A [Member] Maximum [Member] | Aug. 21, 2008 Senior Notes [Member] | Sep. 30, 2013 Senior Notes [Member] | Aug. 21, 2008 Warrant [Member] Class A [Member]
Issuance Of Notes Payable And Warrants [Line Items] |  |  |  |  |  |
Principal amount of senior notes |  |  |  | $ 120,000,000 |  |
Principal amount of senior notes due, year |  |  |  | 2020 |  |
Senior Notes coupon interest (as a percent) |  |  |  | 5.20% |  |
Warrants to purchase Class A shares (in shares) |  |  |  |  |  | 5,455
Class A Common stock par value (in dollars per share) | $ 0.01 | $ 0.01 |  |  |  | $ 0.01
Class A Shares purchase price per share (in dollars per share) |  |  |  |  |  | $ 22.00
Senior notes effective yield (as a percent) |  |  |  |  | 7.94% |
Event of default under the indenture accreted amount due and payable (as a percent) |  |  |  |  | 33.33% |
Maximum percent of aggregate principal amount of senior notes owned by holder or group of affiliates for transfer (as a percent) |  |  |  |  | 15.00% |
Maximum percent of voting securities and total shares of class A common stock owned by holder or group of affiliates for warrant transfer (as a percent) | 2.00% |  |  |  |  |
Percent of outstanding shares of common stock owned by holder or group of affiliates for warrant transfer (as a percent) |  |  | 25.00% |  |  |

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- Details
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- Definition Warrants issued to purchase class A common stock shares. + References No definition available. + Details
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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 Including the current and noncurrent portions, 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). 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 FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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