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v3.19.2

Subsequent Event - Additional Information (Detail) |  |  |  | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 19, 2019 USD ($) $ / shares shares | May 03, 2019 USD ($) $ / shares shares | May 24, 2016 USD ($) $ / shares | Jul. 19, 2019 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) shares | Mar. 31, 2019 USD ($) | Dec. 31, 2018 shares | Dec. 31, 2017 USD ($)
Common stock, shares issued | shares |  | 3,144,531 |  |  | 48,086,422 |  | 43,917,378 |
Common Stock Issue Price Per Share | $ / shares |  | $ 64.00 |  |  |  |  |  |
Exercised number of shares | shares |  |  |  |  | 57,956 |  |  |
Net proceeds |  | $ 189,600,000 |  |  | $ 189,623,000 |  |  |
Notes conversion ratio per $1,000 principal amount | 8.6749 |  |  |  |  |  |  |
2.125% Convertible Senior Notes due 2021 |  |  |  |  |  |  |  |
Notes issued | $ 92,000,000.0 |  | $ 115,000,000.0 | $ 92,000,000.0 |  | $ 17,000 |  | $ 11,000
Notes, interest rate |  |  | 2.125% |  |  |  |  |
Proceeds from issuance of convertible senior notes, net of costs |  |  | $ 111,100,000 |  |  |  |  |
Notes, due date |  |  |  |  | Jun. 01, 2021 |  |  |
Notes conversion ratio per $1,000 principal amount |  |  | 31.1813 |  |  |  |  |
Notes initial conversion price | $ / shares |  |  | $ 32.07 |  |  |  |  |
Underwriters | Common Stock |  |  |  |  |  |  |  |
Exercised number of shares | shares |  | 410,156 |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Common stock, shares issued | shares | 1,587,000 |  |  | 1,587,000 |  |  |  |
Common Stock Issue Price Per Share | $ / shares | $ 87.00 |  |  | $ 87.00 |  |  |  |
Net proceeds |  |  |  | $ 130,700,000 |  |  |  |
Subsequent Event [Member] | 0.375% Convertible Senior Notes due 2024 |  |  |  |  |  |  |  |
Notes issued | $ 287,500,000 |  |  | $ 287,500,000 |  |  |  |
Notes, interest rate | 0.375% |  |  | 0.375% |  |  |  |
Proceeds from issuance of convertible senior notes, net of costs |  |  |  | $ 278,400,000 |  |  |  |
Interest repayment terms | Interest will be payable semi-annually in arrears on January 15 and July 15 of each year, beginning on January 15, 2020 |  |  |  |  |  |  |
Notes, due date | Jul. 15, 2024 |  |  |  |  |  |  |
Notes initial conversion price | $ / shares | $ 115.28 |  |  | $ 115.28 |  |  |  |
Notes redemption price | 100.00% |  |  |  |  |  |  |
Subsequent Event [Member] | 2.125% Convertible Senior Notes due 2021 |  |  |  |  |  |  |  |
face amount of remaining convertible debt | $ 23,000,000.0 |  |  | $ 23,000,000.0 |  |  |  |
Subsequent Event [Member] | 2.125% Convertible Senior Notes due 2021 | Partial Private Settlement [Member] |  |  |  |  |  |  |  |
Notes, interest rate | 2.125% |  |  | 2.125% |  |  |  |
Repurchased Face Amount | $ 92,000,000.0 |  |  | $ 92,000,000.0 |  |  |  |
Repayment Of Senior Debt |  |  |  | $ 92,300,000 |  |  |  |
Conversion of Convertible Securities Stock Issued | shares | 1,850,155 |  |  |  |  |  |  |
Subsequent Event [Member] | Underwriters |  |  |  |  |  |  |  |
Exercised number of shares | shares |  |  |  | 37.5 |  |  |  |
Subsequent Event [Member] | Underwriters | Common Stock |  |  |  |  |  |  |  |
Exercised number of shares | shares |  |  |  | 207,000 |  |  |  |

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