Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) Cases site Plaintiff	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Loss Contingencies [Line Items]
Liable periods	twenty-year
Litigation settlement amount	$ 1,150,000,000
Recoveries receivable	0	$ 0
Net Payments, net	1,252,000	10,106,000	$ 3,299,000
Payments		2,900,000
Aggregate amount of payments	$ 6,000,000
Payment for environmental liabilities		2,900,000	1,000,000	$ 2,000,000
Discount rate	3.00%
Prepayments during 2014		1,900,000
Accrued environmental obligations approximately	$ 113,133,000	$ 110,015,000	$ 113,636,000	$ 48,006,000
Sites associated with remediation | site	42
Remediation and related matters possible to estimate costs	$ 166,000,000
Currently not able to estimate a range of costs to sites | site	5
Customer Concentration Risk | Sales Revenue
Loss Contingencies [Line Items]
Customers accounted	48.00%	47.00%	42.00%
Harley Davidson Inc | CompX Security Products Business
Loss Contingencies [Line Items]
Customer accounted for 10% or more of sales	12.00%	12.00%	12.00%
United States Postal Service | CompX Security Products Business
Loss Contingencies [Line Items]
Customer accounted for 10% or more of sales	13.00%	13.00%
Product Liability And Occupational Exposure Litigation Claims
Loss Contingencies [Line Items]
Number of cases pending | Cases	102
Product Liability And Occupational Exposure Litigation Claims | Administratively Dismissed Claims
Loss Contingencies [Line Items]
Number of plaintiffs involved | Cases	8,692
Product Liability And Occupational Exposure Litigation Claims | Pending Claims
Loss Contingencies [Line Items]
Number of plaintiffs involved | Plaintiff	588
Minimum
Loss Contingencies [Line Items]
Number of cases settled and dismissed and found not liable | Cases	100