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Components of Calculation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | [1] | Sep. 30, 2015 | [1] | Jun. 30, 2015 | [1] | Mar. 31, 2015 | [1] | Dec. 31, 2014 | [2] | Sep. 30, 2014 | [2] | Jun. 30, 2014 | [2] | Mar. 31, 2014 | [2] | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 26,549 | $ 70,316 | $ 42,244 | $ 33,304 | $ 23,636 | $ 83,276 | $ 44,003 | $ 31,476 | $ 172,413 | $ 182,391 | $ 185,413
Weighted average number of shares used in: |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  |  |  |  |  |  |  |  | 61,021 | 63,426 | 64,254
Dilutive common stock equivalents: |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  | 285 | 319 | 404
Diluted earnings per share |  |  |  |  |  |  |  |  | 61,306 | 63,745 | 64,658
[1] | The first, second, third and fourth quarters of 2015 include rationalization charges of $0.7 million, $1.0 million, $9.1 million and $3.6 million, respectively.
[2] | The first, second, third and fourth quarters of 2014 include rationalization charges of $1.6 million, $0.9 million, $2.5 million and $9.5 million, respectively, and (loss) income from operations in Venezuela of $(0.5) million, $(2.9) million, $0.8 million and $(0.5) million, respectively. The first quarter of 2014 includes a loss on early extinguishment of debt of $1.5 million.

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