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Equity and Liability Components of Notes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |
Principal amount of convertible notes outstanding | $ 323,548 | $ 344,490
Unamortized discount of liability component | (10,596) | (19,217)
Less: current portion | (37,611) | (496)
Long-term debt | 275,341 | 324,777
Convertible Senior Notes |  |
Debt Instrument [Line Items] |  |
Principal amount of convertible notes outstanding | 131,000 | 150,000
Unamortized discount of liability component | (9,732) | (15,399)
Net carrying amount of liability component | 121,268 | 134,601
Less: current portion | (35,165) | 0
Long-term debt | 86,103 | 134,601
Carrying value of equity component, net of issuance costs | $ 15,810 | $ 20,993
Remaining amortization period of discount on the liability component | 2 years 3 months 18 days | 3 years 3 months 18 days

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + 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 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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