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Long-term debt - CompX - Additional Information (Detail) (CompX [Member], Promissory Note [Member]) | Mar. 31, 2013
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CompX [Member] | Promissory Note [Member] |
Line of Credit Facility [Line Items] |
Average interest rate on long-term debt | 1.30%

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

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- Definition Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument at that time. + References No definition available. + Details
Name: | us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant