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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
State
Store
Entity
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Significant Accounting Policies [Line Items]      
Number of joint ventures | Entity 3    
Allowance for doubtful accounts $ 7,087 $ 7,943  
Capitalized vendor rebates 13,434 12,007  
Goodwill and intangible assets impairment 0 0 $ 0
Accrued sales returns 12,739 12,181  
Selling, general and administrative expense 833,051 800,328 757,452
Finance lease ROU assets 6,232 3,150  
Finance lease liabilities 6,383 3,231  
Reduction of inventory due to cash discount recorded 12,029 10,098  
Shipping and Handling [Member]      
Significant Accounting Policies [Line Items]      
Selling, general and administrative expense 55,019 54,783 51,741
Advertising Expense [Member]      
Significant Accounting Policies [Line Items]      
Selling, general and administrative expense $ 12,588 $ 16,587 $ 16,520
Minimum [Member]      
Significant Accounting Policies [Line Items]      
Operating Lease Remaining Lease Term 1 year    
Maximum [Member]      
Significant Accounting Policies [Line Items]      
Operating Lease Remaining Lease Term 9 years    
Maximum [Member] | Service Revenue Net [Member] | Product Concentration Risk      
Significant Accounting Policies [Line Items]      
Percentage of revenue 1.00% 1.00%  
Buildings and Improvements | Minimum [Member]      
Significant Accounting Policies [Line Items]      
Estimated useful lives in years 3 years    
Buildings and Improvements | Maximum [Member]      
Significant Accounting Policies [Line Items]      
Estimated useful lives in years 40 years    
Machinery, Vehicles and Equipment | Minimum [Member]      
Significant Accounting Policies [Line Items]      
Estimated useful lives in years 3 years    
Machinery, Vehicles and Equipment | Maximum [Member]      
Significant Accounting Policies [Line Items]      
Estimated useful lives in years 10 years    
Computer Hardware and Software | Minimum [Member]      
Significant Accounting Policies [Line Items]      
Estimated useful lives in years 3 years    
Computer Hardware and Software | Maximum [Member]      
Significant Accounting Policies [Line Items]      
Estimated useful lives in years 10 years    
Furniture and Fixtures | Minimum [Member]      
Significant Accounting Policies [Line Items]      
Estimated useful lives in years 5 years    
Furniture and Fixtures | Maximum [Member]      
Significant Accounting Policies [Line Items]      
Estimated useful lives in years 7 years    
Watsco, Inc.      
Significant Accounting Policies [Line Items]      
Number of locations from which entity operates | Store 600    
Number of states in which entity operates | State 38