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Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2011	Dec. 31, 2012 Customer	Dec. 31, 2011	Dec. 31, 2010
Concentration Risk [Line Items]
Litigation settlement gain	$ 7,500,000
Number of customers accounted for sale		10
Rent expense		$ 126,000	$ 155,000	$ 160,000
Ten Largest Customers [Member]
Concentration Risk [Line Items]
Sales Revenue, percentage		38.00%	39.00%	38.00%
Harley Davidson [Member] | Compx Security Products Business [Member]
Concentration Risk [Line Items]
Sales Revenue, percentage		12.00%	13.00%	12.00%
San Mateo Postal Data [Member] | Compx Security Products Business [Member]
Concentration Risk [Line Items]
Sales Revenue, percentage				11.00%

X

- Definition

Concentration Risk Number Of Customer

+ References

No definition available.

+ Details

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- Definition

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

+ References

No definition available.

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- Definition

The net proceeds or assets obtained in excess of (less than) the net carrying amount of assets recorded, or assets distributed and liabilities assumed less than (in excess of) estimated litigation liability extinguished, in settlement of a litigation matter. Represents (for other than an insurance entity in its normal claims settlement process), the amount of income (expense) recognized in the period to settle pending or threatened litigation and insurance claims.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

+ References

No definition available.

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