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Financial Instruments and Fair Value Measurements - Summary of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Note receivable from affiliate | $ 10,700 |
Noncontrolling interest in CompX common stock | 16,060 | $ 15,301
Carrying amount |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, cash equivalents and restricted cash | 105,611 | 100,981
Note receivable from affiliate | 10,700 |
Noncontrolling interest in CompX common stock | 16,060 | 15,301
Fair value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, cash equivalents and restricted cash | 105,611 | 100,981
Note receivable from affiliate | 10,700 |
Noncontrolling interest in CompX common stock | $ 19,269 | $ 18,878

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