Financial Instruments and Fair Value Measurements - Summary of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Noncontrolling interest in CompX common stock	$ 15,507	$ 15,301
Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	100,160	100,981
Noncontrolling interest in CompX common stock	15,507	15,301
Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	100,160	100,981
Noncontrolling interest in CompX common stock	$ 17,388	$ 18,878