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Debt - Long-Term Debt and Lease Obligation (Parenthetical) (Detail)	Mar. 31, 2018	Dec. 31, 2017
2024 term loan
Debt Instrument [Line Items]
Weighted average interest rate	4.70%	4.30%
2022 facility
Debt Instrument [Line Items]
Weighted average interest rate	3.50%	2.90%

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DebtInstrumentAxis=bldr_TwoThousandTwentyFourTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=bldr_TwoThousandTwentyTwoSeniorSecuredRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: