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Summary Of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]      
Allowance for uncollectible accounts $ 100 $ 400  
Property and equipment, gross 398,035 396,356  
Depreciation and amortization 60,187 57,125 $ 50,586
Capitalized Computer Software, Gross 68,400 75,200  
Software amortization $ 15,400 $ 16,400 14,200
Customer relationships      
Summary Of Significant Accounting Policies [Line Items]      
Intangible assets useful life (in years) 14 years 14 years  
Customer relationships | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Intangible assets useful life (in years) 10 years    
Customer relationships | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Intangible assets useful life (in years) 15 years    
Other Intangibles      
Summary Of Significant Accounting Policies [Line Items]      
Intangible assets useful life (in years) 5 years 6 years  
Other Intangibles | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Intangible assets useful life (in years) 1 year    
Other Intangibles | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Intangible assets useful life (in years) 15 years    
Software technology | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Intangible assets useful life (in years) 3 years    
Software technology | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Intangible assets useful life (in years) 10 years    
Warehouse equipment      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment, gross $ 168,599 $ 169,083  
Warehouse equipment | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment useful life (in years) 4 years    
Warehouse equipment | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment useful life (in years) 15 years 8 years  
Building and improvements      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment, gross $ 75,229 $ 87,974  
Building and improvements | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment useful life (in years) 5 years    
Building and improvements | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment useful life (in years) 40 years    
Computer equipment      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment, gross $ 53,566 31,162  
Computer equipment | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment useful life (in years) 3 years    
Computer equipment | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment useful life (in years) 8 years    
Furniture and fixtures      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment, gross $ 14,517 12,539  
Furniture and fixtures | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment useful life (in years) 3 years    
Furniture and fixtures | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment useful life (in years) 8 years    
Office equipment and other      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment, gross $ 8,216 19,781  
Office equipment and other | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment useful life (in years) 3 years    
Office equipment and other | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment useful life (in years) 8 years    
Warehouse Facilities | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 1 year    
Warehouse Facilities | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 30 years    
Transportation And Material Handling Equipment | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 3 years    
Transportation And Material Handling Equipment | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 10 years    
Foreign Subsidiaries      
Summary Of Significant Accounting Policies [Line Items]      
Cash, cash-equivalents, short-term investments, and marketable securities $ 46,000 31,500  
S,G&A Expenses      
Summary Of Significant Accounting Policies [Line Items]      
Shipping and handling costs 548,600 576,800 $ 528,200
International Segment | Acquisition-related and Exit and Realignment Charges | Information Systems Related Costs      
Summary Of Significant Accounting Policies [Line Items]      
Accelerated amortization 4,500 6,000  
Estimated Useful Life | Warehouse equipment      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment, gross 12,900    
Depreciation and amortization $ (900)    
New Accounting Pronouncement, Early Adoption, Effect      
Summary Of Significant Accounting Policies [Line Items]      
Deferred tax liabilities, current   (38,000)  
Deferred tax assets, current   $ (800)