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Earnings Per Share - (Additional Information) (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 22, 2019 | Sep. 23, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jul. 31, 2019 | Jul. 19, 2019 | Jul. 16, 2019 | Dec. 31, 2018
Stock options, outstanding |  |  | 959,916 |  | 959,916 |  |  |  |  | 998,226
Stock options, weighted average exercise price |  |  | $ 30.44 |  | $ 30.44 |  |  |  |  | $ 27.54
Common stock excluded from calculation of diluted earnings per share |  |  | 47,705 | 329,409 | 85,503 | 485,520 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Conversion of Convertible Securities Stock Issued |  |  | 2,316,200 |  |  |  |  |  |  |
2.125% Convertible Senior Notes due 2021 |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 115,000,000.0 |  | $ 115,000,000.0 |  |  |  | $ 92,000,000.0 |
2.125% Convertible Senior Notes due 2021 | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Conversion of Convertible Securities Stock Issued | 1,850,155 | 466,045 |  |  |  |  |  |  |  |
0.375% Convertible Senior Notes due 2024 |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 287,500,000 | $ 287,500,000 |  |
Option To Purchase Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Stock options, outstanding |  |  | 959,916 | 1,033,312 | 959,916 | 1,033,312 |  |  |  |
Stock options, weighted average exercise price |  |  | $ 30.44 | $ 26.99 | $ 30.44 | $ 26.99 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Restricted stock units, outstanding |  |  | 740,213 | 707,716 | 740,213 | 707,716 |  |  |  | 707,413

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