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v3.19.1

Leases:Terms (Details) | 3 Months Ended
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Mar. 31, 2019
Lessee, Lease, Description [Line Items] |
Minimum initial term of real estate leases | 1 year
Real Estate Leases, Cancellation Notice, Latest Notice | 30 days
Real Estate Leases, Cancellation Notice, Earliest Notice | 90 days
Minimum [Member] |
Lessee, Lease, Description [Line Items] |
Operating Lease, Renewal Term | 1 year
Maximum [Member] |
Lessee, Lease, Description [Line Items] |
Operating Lease, Renewal Term | 10 years

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- Definition The minimum initial lease term of real estate leases. + References No definition available. + Details
Name: | bcc_LeaseTermMinimumInitialTermofRealEstateLeases
Namespace Prefix: | bcc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The earliest notice on certain real estate leases to cancel the lease contract. + References No definition available. + Details
Name: | bcc_RealEstateLeasesCancellationNoticeEarliestNotice
Namespace Prefix: | bcc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The latest notice on certain real estate leases to cancel the lease contract. + References No definition available. + Details
Name: | bcc_RealEstateLeasesCancellationNoticeLatestNotice
Namespace Prefix: | bcc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |