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Earnings Per Share - (Additional Information) (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 22, 2019 | Sep. 23, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Jul. 31, 2019 | Jul. 19, 2019 | Jul. 16, 2019
Stock options, outstanding |  |  | 768,904 | 985,266 | 768,904 | 985,266 | 957,559 |  |  |
Stock options, weighted average exercise price |  |  | $ 38.87 | $ 30.16 | $ 38.87 | $ 30.16 | $ 30.81 |  |  |
Common stock excluded from calculation of diluted earnings per share |  |  | 11,578 | 119,026 | 12,328 | 180,160 |  |  |  |
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 |
Restricted Stock Units and Performance Stock Units |  |  |  |  |  |  |  |  |  |
Restricted stock units, outstanding |  |  | 696,098 | 766,986 | 696,098 | 766,986 | 734,984 |  |  |

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