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v3.21.2

Related Party Transactions - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2021
Related Party Transactions [Abstract] |
Percentage of accounts receivable due from and net sales | 1.00%

X
- Definition Percentage of accounts receivable due from and net sales. + References No definition available. + Details
Name: | bldr_PercentageOfAccountsReceivableDueFromAndNetSales
Namespace Prefix: | bldr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration