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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
Segment
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
Nov. 25, 2024
$ / shares
Sep. 30, 2024
Aug. 27, 2024
$ / shares
May 23, 2024
$ / shares
Feb. 22, 2024
$ / shares
Summary Of Significant Accounting Policies [Line Items]                  
Non-controlling Interests Percentage 100.00% 100.00%              
Reserve for uncollectible accounts $ 26,700 $ 26,700 $ 34,700            
Depreciation   106,700 114,400 $ 103,100          
Net Income (Loss)   $ 103,993 $ 167,528 $ 356,948          
Earnings per share - basic | $ / shares   $ 1.72 $ 2.65 $ 5.37          
Earnings per share - diluted | $ / shares   $ 1.7 $ 2.62 $ 5.32          
Number of reportable segments | Segment   2              
Number of Reporting Units | Segment   2              
Accrual for estimated claims 38,500 $ 38,500 $ 39,100            
Dividends payable, amount per share | $ / shares         $ 0.125   $ 0.125 $ 0.125 $ 0.125
Federal and State [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
State and federal tax net operating losses, valuation allowance 2,900 $ 2,900              
Transportation Equipment [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Property and equipment estimated life           20 years      
Depreciation 10,000                
Net Income (Loss) $ 7,900                
Earnings per share - basic | $ / shares $ 0.13                
Earnings per share - diluted | $ / shares $ 0.13                
Software Development [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Intangible assets estimated useful life 10 years 10 years              
Leasehold Improvements [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration] us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember              
Corporacion Interamericana de Logistica S A de C V [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Ownership percentage 51.00% 51.00%              
Maximum [Member] | Customer Concentration Risk [Member] | Revenue [Member] | Service [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Concentration risk (as a percentage)   10.00% 10.00% 10.00%          
Maximum [Member] | Building And Improvement [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Property and equipment estimated life 40 years 40 years              
Maximum [Member] | Computer Equipment and Software [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Property and equipment estimated life 10 years 10 years              
Maximum [Member] | Furniture and Equipment [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Property and equipment estimated life 10 years 10 years              
Maximum [Member] | Transportation Equipment [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Property and equipment estimated life 20 years 20 years