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Convertible Senior Notes - Narrative (Detail) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 18, 2014 | Mar. 17, 2014 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |
Convertible senior notes, carrying value |  |  | $ 250,949,000 |  | $ 250,949,000 |  | $ 249,994,000
Company share price (in dollars per share) |  |  | $ 18.55 |  | $ 18.55 |  |
Convertible Debt [Member] | 2019 Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Equity component of the notes |  |  |  |  | $ 11,445,000 |  |
Interest expense on debt |  |  | $ 3,503,000 | $ 3,503,000 | 7,006,000 | $ 7,006,000 |
Additional non-cash interest expense |  |  | 913,000 | $ 883,000 | 1,814,000 | $ 1,759,000 |
Convertible Debt [Member] | March 2019 Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  | $ 143,750,000 | $ 143,750,000 |  | $ 143,750,000 |  |
Coupon rate |  | 5.50% | 5.50% |  | 5.50% |  |
Proceeds from issuance of convertible senior notes |  | $ 139,037,000 |  |  |  |  |
Convertible senior notes, carrying value |  |  | $ 142,007,000 |  | $ 142,007,000 |  |
Unamortized discount |  |  | 1,743,000 |  | 1,743,000 |  |
Convertible Debt [Member] | August 2019 Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount | $ 111,000,000 |  | $ 111,000,000 |  | $ 111,000,000 |  |
Coupon rate | 5.50% |  | 5.50% |  | 5.50% |  |
Proceeds from issuance of convertible senior notes | $ 109,615,000 |  |  |  |  |  |
Convertible senior notes, carrying value |  |  | $ 108,942,000 |  | $ 108,942,000 |  |
Unamortized discount |  |  | $ 2,058,000 |  | 2,058,000 |  |
Conversion rate basis, principal amount |  |  |  |  | $ 1,000,000 |  |

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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 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(13)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 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 Reference 3: 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(a)(16)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: 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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