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Fair Value Measurement - Additional Information (Detail) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | May 24, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of other assets | $ 0 | $ 0 |
Fair value of other liabilities | $ 0 | 0 |
2.125% Convertible Senior Notes due 2021 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Principal amount |  | 11,000 | $ 115,000,000
Notes, due date | Jun. 01, 2021 |  |
Notes, frequency of periodic payment | Semi-annually |  |
Notes, date of first required payment | Dec. 01, 2016 |  |
Total convertible senior notes | $ 101,329,000 | $ 99,250,000 |
Fair value of convertible senior notes | $ 178,800,000 |  |

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