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Accounts and Other Receivables, Net - Schedule of Accounts Notes Loans and Financing Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Accrued insurance recoveries $ 346us-gaap_InsuranceSettlementsReceivableCurrent $ 1,877us-gaap_InsuranceSettlementsReceivableCurrent
Other receivables 163us-gaap_OtherReceivablesGrossCurrent 106us-gaap_OtherReceivablesGrossCurrent
Total 9,256us-gaap_AccountsAndOtherReceivablesNetCurrent 10,517us-gaap_AccountsAndOtherReceivablesNetCurrent
Trade Receivables    
Receivables [Abstract]    
Trade receivables - CompX 8,825us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
8,662us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
Allowance for doubtful accounts $ (78)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
$ (128)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember