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Earnings Per Share - Components of Calculation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | [1] | Sep. 30, 2019 | [1] | Jun. 30, 2019 | [1] | Mar. 31, 2019 | [1] | Dec. 31, 2018 | [2] | Sep. 30, 2018 | [2] | Jun. 30, 2018 | [2] | Mar. 31, 2018 | [2] | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 34,843 | $ 81,274 | $ 30,955 | $ 46,742 | $ 38,191 | $ 84,739 | $ 55,343 | $ 45,721 | $ 193,814 | $ 223,994 | $ 269,659
Weighted average number of shares used in: |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  |  |  |  |  |  |  |  | 110,939 | 110,603 | 110,353
Dilutive common stock equivalents: |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  | 569 | 1,029 | 1,010
Diluted earnings per share |  |  |  |  |  |  |  |  | 111,508 | 111,632 | 111,363
[1] | The first, second, third and fourth quarters of 2019 include rationalization charges of $6.1 million, $39.3 million, $3.2 million and $7.8 million, respectively. The third quarter of 2019 includes a loss on early extinguishment of debt of $1.7 million. The fourth quarter of 2019 includes costs attributed to announced acquisitions of $1.8 million.
[2] | The first, second, third and fourth quarters of 2018 include rationalization charges of $0.7 million, $0.5 million, $0.3 million and $4.8 million, respectively. The second quarter of 2018 includes a loss on early extinguishment of debt of $2.5 million.

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