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Selected Quarterly Financial Data (Unaudited) - Summary of Selected Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 952,730 $ 924,812 $ 779,243 $ 838,859 $ 900,681 $ 913,275 $ 921,163 $ 932,998 $ 3,495,644 $ 3,668,117 $ 3,683,593
Gross margin 105,559 108,035 107,249 104,594 125,860 135,218 132,703 127,289 425,437 521,070 445,601
Operating income 31,172 33,917 20,978 19,759 38,864 37,246 40,721 35,589 105,826 152,420 124,919
Income before provision for income taxes 29,038 31,558 18,019 17,485 37,273 35,135 38,596 32,866 96,100 143,870 116,725
Net income $ 22,388 $ 24,781 $ 13,154 $ 13,236 $ 27,955 $ 26,105 $ 29,217 $ 23,894 $ 73,559 $ 107,171 $ 201,740
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.