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Convertible Senior Notes (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2014 | Jul. 31, 2013
Debt Instrument [Line Items] |  |  |  |
Long term debt, principal amount | $ 157,668 | $ 156,647 |  |
4.25% Convertible Senior Notes (due 2018) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, maturity year | 2018 | 2018 |  |
Debt instrument, interest rate | 4.25% | 4.25% |  | 4.25%
Long term debt, principal amount | $ 21,178 | $ 21,178 |  | $ 100,000
3.25% Convertible Senior Notes (due 2020) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, maturity year | 2020 | 2020 |  |
Debt instrument, interest rate | 3.25% | 3.25% |  |
Long term debt, principal amount | $ 23,490 | $ 22,469 |  |
4.875% Convertible Senior Notes (due 2020) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, maturity year | 2020 | 2020 |  |
Debt instrument, interest rate | 4.875% | 4.875% | 4.875% |
Long term debt, principal amount | $ 113,000 | $ 113,000 | $ 115,000 |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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