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Acquisitions - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 09, 2020
USD ($)
Carrier
Dec. 03, 2018
USD ($)
Apr. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
 [1]
Jun. 30, 2020
USD ($)
 [2]
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]                              
Amortization expense of intangible assets                         $ 13,800 $ 13,800  
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
Operating income         $ 31,172 $ 33,917 $ 20,978 $ 19,759 $ 38,864 $ 37,246 $ 40,721 $ 35,589 105,826 $ 152,420 124,919
Nonstop Delivery ,LLC [Member]                              
Business Acquisition [Line Items]                              
Business acquisition date Dec. 09, 2020                            
Percentage of equity interests acquired 100.00%                            
Consideration for transaction $ 103,300                            
Business acquisition, cash paid 89,700                            
Settlement of accounts receivable due from subsidiary $ 13,600                            
Number of network carriers | Carrier 170                            
Goodwill and other intangible assets tax deductible, period 15 years                            
Transaction costs $ 1,000                            
Amortization expense of intangible assets                         $ 400    
Intangible assets, weighted average useful life                         14 years 29 days    
Revenue                         $ 10,200    
Operating income                         $ 900    
CaseStack, Inc. [Member]                              
Business Acquisition [Line Items]                              
Consideration for transaction   $ 252,858                          
Business acquisition, cash paid   249,389 $ 700 $ 248,700                      
Transaction costs                             $ 1,400
Revenue       20,800                      
Operating income       $ 700                      
Deferred purchase consideration   $ 3,469                          
Deferred purchase consideration payable term   24 months                          
[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.