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 |