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Organization - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Feb. 02, 2019
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |
Total cost of convertible note hedge transactions |  | $ 91,857
Cash proceeds from sale of warrants |  | 51,021
Total cash proceeds, net of discounts upon original issuance and offering costs | $ 287,800 |
Discounts upon original issuance and offering costs | 6,300 |
Convertible Senior Notes Due 2023 [Member] |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |
Debt instrument, principal amount |  | $ 335,000
Cash proceeds from sale of warrants | 51,000 |
Convertible Senior Notes Due 2023 [Member] | Convertible Bond Hedge and Warrant Transactions [Member] |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |
Total cost of convertible note hedge transactions | 91,900 |
Private Placement [Member] | Convertible Senior Notes Due 2023 [Member] |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |
Debt instrument, principal amount | $ 300,000 |
Debt instrument, interest rate | 0.00% |
Over Allotment Option in Private Placement [Member] | Convertible Senior Notes Due 2023 [Member] |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |
Debt instrument, principal amount | $ 35,000 |

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