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Fair Value Measurements (Details) $ in Millions	Dec. 31, 2016 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Difference between fair value and carrying value of mortgage	$ (3.7)
Discounted carrying value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of mortgage	$ 126.8

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- Definition

Represents mortgage loan fair value disclosure.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

MortMortgage Loan Fair Value Disclosure, Value Carrying Value Exceeds Fair Value

+ References

No definition available.

+ Details

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Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- 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
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X

- Details

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Data Type:	na
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Period Type: