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Convertible Senior Notes - Narrative (Detail) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Aug. 18, 2014 | Mar. 17, 2014 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Convertible senior notes, carrying value |  |  | $ 248,617,000 |  | $ 248,173,000
Convertible Debt [Member] | 2019 Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Conversion price (in dollars per share) |  |  | $ 18.06 |  |
Equity component of the notes |  |  | $ 11,445,000 |  |
Interest expense on debt |  |  | 3,503,000 | $ 3,503,000 |
Additional non-cash interest expense |  |  | 876,000 | $ 844,000 |
Convertible Debt [Member] | March 2019 Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  | $ 143,750,000 |  |  |
Coupon Rate |  | 5.50% |  |  |
Proceeds from issuance of convertible senior notes |  | $ 139,037,000 |  |  |
Convertible senior notes, carrying value |  |  | 140,845,000 |  |
Unamortized discount |  |  | 2,905,000 |  |
Convertible Debt [Member] | August 2019 Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount | $ 111,000,000 |  |  |  |
Coupon Rate | 5.50% |  |  |  |
Proceeds from issuance of convertible senior notes | $ 109,615,000 |  |  |  |
Convertible senior notes, carrying value |  |  | 107,772,000 |  |
Unamortized discount |  |  | $ 3,228,000 |  |

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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 03 -Paragraph 16 -Article 9 Reference 4: 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 The price per share of the conversion feature embedded in the debt instrument. + 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 (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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