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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) Entity Store State | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Significant Accounting Policies [Line Items] |  |  |
Number of joint ventures | Entity | 3 |  |
Allowance for doubtful accounts | $ 7,943 | $ 6,503 |
Capitalized vendor rebates | 12,007 | 11,603 |
Goodwill and intangible assets impairment | 0 | 0 | $ 0
Accrued sales returns | 12,181 | 11,275 |
Selling, general and administrative expense | 800,328 | 757,452 | 715,671
Finance lease ROU assets | 3,150 |  |
Finance lease liabilities | 3,231 |  |
Shipping and Handling [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Selling, general and administrative expense | 54,783 | 51,741 | 47,670
Advertising Expense [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Selling, general and administrative expense | $ 16,587 | $ 16,520 | $ 24,677
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 | 10 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 |  |
Other Depreciable Assets | Minimum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives in years | 3 years |  |
Other Depreciable Assets | 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 | 606 |  |
Number of states in which entity operates | State | 38 |  |

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