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Related Party Transaction (Details) (Board of Directors Chairman [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010 partnerships
Board of Directors Chairman [Member]
Related Party Transaction [Line Items]
Number of partnerships		2
Legal Fees	$ 0.1	$ 0.7

X

- Definition

Related Party Number of Partnerships With Interest in Company Common Stock

+ References

No definition available.

+ Details

Name:	laws_RelatedPartyNumberOfPartnershipsWithInterestInCompanyCommonStock
Namespace Prefix:	laws_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Related Party Transaction Legal Fees

+ References

No definition available.

+ Details

Name:	laws_RelatedPartyTransactionLegalFees
Namespace Prefix:	laws_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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