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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%

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- Definition Concentration Risk Number Of Customer + References No definition available. + Details
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- 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. + Details
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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-Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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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. + Details
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