Financial Instruments - Summary of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Noncontrolling interest in CompX common stock	$ 15,301	$ 14,428
Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	100,981	77,975
Noncontrolling interest in CompX common stock	15,301	14,428
Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	100,981	77,975
Noncontrolling interest in CompX common stock	$ 18,878	$ 19,936