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Reconciliation of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
 [1]
Jun. 30, 2020
 [2]
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]                      
Net income from continuing operations for basic and diluted earnings per share                 $ 73,559 $ 107,171 $ 87,661
Net income from discontinued operations for basic and diluted earnings per share                     114,079
Net income $ 22,388 $ 24,781 $ 13,154 $ 13,236 $ 27,955 $ 26,105 $ 29,217 $ 23,894 $ 73,559 $ 107,171 $ 201,740
Weighted average shares outstanding - basic                 33,180 33,284 33,393
Dilutive effect of restricted stock                 363 196 167
Weighted average shares outstanding - diluted                 33,543 33,480 33,560
Earnings per share from continuing operations                      
Basic                 $ 2.22 $ 3.22 $ 2.62
Diluted                 2.19 3.20 2.61
Earnings per share from discontinued operations                      
Basic                     3.42
Diluted                     3.40
Earnings per share net income                      
Basic $ 0.67 $ 0.75 $ 0.40 $ 0.40 $ 0.85 $ 0.79 $ 0.87 $ 0.71 2.22 3.22 6.04
Diluted $ 0.67 $ 0.74 $ 0.39 $ 0.40 $ 0.84 $ 0.78 $ 0.87 $ 0.71 $ 2.19 $ 3.20 $ 6.01
[1]

We donated an additional $0.2 million of refrigerated trailers during the third quarter of 2020.

[2]

We donated refrigerated trailers with a carrying value of approximately $5.4 million during the second quarter of 2020 to be used by emergency responders in fighting the COVID-19 pandemic.