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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Entity
Dec. 31, 2012
Dec. 31, 2011
Significant Accounting Policies [Line Items]      
Number of joint ventures 3    
Allowance for doubtful accounts $ 5,737 $ 10,473  
Capitalized vendor rebates 9,333 8,015  
Advertising expense 22,418 23,730 25,052
Shipping and handling costs $ 39,395 $ 37,676 $ 30,234
Minimum | Buildings and Improvements
      
Significant Accounting Policies [Line Items]      
Estimated useful lives in years 3 years    
Minimum | Other Depreciable Assets
      
Significant Accounting Policies [Line Items]      
Estimated useful lives in years 3 years    
Maximum | Buildings and Improvements
      
Significant Accounting Policies [Line Items]      
Estimated useful lives in years 40 years    
Maximum | Other Depreciable Assets
      
Significant Accounting Policies [Line Items]      
Estimated useful lives in years 10 years    
Watsco, Inc.
      
Significant Accounting Policies [Line Items]      
Number of locations from which entity operates 569    
Number of states in which entity operates 38