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Subsequent Event - Additional Information (Detail) $ in Thousands |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 26, 2018 USD ($) | Jul. 31, 2013 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Subsequent Event [Line Items] |  |  |  |
Debt instrument face value |  |  | $ 160,078 | $ 156,647
4.25% Convertible Senior Notes (due 2018) |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Debt instrument, maturity date |  | Aug. 01, 2018 |  |
Debt instrument, interest rate |  | 4.25% | 4.25% | 4.25%
Debt instrument face value |  | $ 100,000 | $ 21,178 | $ 21,178
3.25% Convertible Senior Notes (due 2020) |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Debt instrument, interest rate |  |  | 3.25% | 3.25%
Debt instrument face value |  |  | $ 25,900 | $ 22,469
Subsequent Event | 4.25% Convertible Senior Notes (due 2018) |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Debt amount converted | $ 8,000 |  |  |
Debt instrument, maturity date | Aug. 01, 2018 |  |  |
Debt instrument, interest rate | 4.25% |  |  |
Subsequent Event | 3.25% Convertible Senior Notes (due 2020) |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Debt instrument, maturity date | Nov. 01, 2020 |  |  |
Debt instrument, interest rate | 3.25% |  |  |
Conversion rate in share per $1000 principal amount of notes | 322.2688 |  |  |
Debt instrument face value | $ 8,000 |  |  |

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- Definition The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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