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Retirement and Security Bonus Plans Retirement and Security Bonus Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
401k Employer matching contributions	$ 2.9us-gaap_DefinedContributionPlanCostRecognized	$ 2.7us-gaap_DefinedContributionPlanCostRecognized	$ 1.7us-gaap_DefinedContributionPlanCostRecognized
Employer contributions, profit sharing retirement plan	0.6us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	0.1us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	0.5us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Cash Surrender Value, Fair Value Disclosure	1.1us-gaap_CashSurrenderValueFairValueDisclosure
Security bonus plan
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Initial vesting percentage	25.00%laws_DeferredCompensationVestingPercentageInitial / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredProfitSharingMember
Minimum vesting period	5 years
Annual vesting percentage after initial period	5.00%laws_DeferredCompensationAnnualVestingPercentageAfterFiveYears / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredProfitSharingMember
Expense recognized	$ 0.6us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredProfitSharingMember	$ 0.7us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredProfitSharingMember	$ 2.1us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredProfitSharingMember

X

- Definition

Deferred Compensation Annual Vesting Percentage After Five Years

+ References

No definition available.

+ Details

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Namespace Prefix:	laws_
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X

- Definition

Deferred Compensation Minimum Vesting Period

+ References

No definition available.

+ Details

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Namespace Prefix:	laws_
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Balance Type:	na
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X

- Definition

Deferred Compensation Vesting Percentage Initial

+ References

No definition available.

+ Details

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Namespace Prefix:	laws_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Surrender Value

-URI http://asc.fasb.org/extlink&oid=6507153

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 30

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Details

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

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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