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Carrying Amounts and Estimated Fair Values of Debt Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Nov. 30, 2015 | Dec. 31, 2014 | May. 31, 2014
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Long term debt-December 2012 financing, carrying value | $ 91,512 |  | $ 89,617 |
Long term debt-December 2012 financing, estimated fair value | 87,700 |  | 81,000 |
Convertible Debt | 2012 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Exchangeable senior notes, carrying value | 15,107 |  | 31,266 |
Exchangeable senior notes, estimated fair value | 13,637 |  | 25,689 |
Convertible Debt | 2014 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Exchangeable senior notes, carrying value | 96,364 |  | 90,580 |
Exchangeable senior notes, estimated fair value | 108,034 |  | $ 75,533 | $ 90,800
Convertible Debt | 2015 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Exchangeable senior notes, carrying value | 27,134 |  |  |
Exchangeable senior notes, estimated fair value | $ 28,448 | $ 27,500 |  |

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611 + 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 fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 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 2: 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 + Details
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