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Goodwill - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill amortization period	15 years

X

- Definition

The period over which goodwill will be amortized for tax purposes.

+ References

No definition available.

+ Details

Name:	bldr_GoodwillAmortizationPeriodForTaxPurposes
Namespace Prefix:	bldr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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