Income Taxes - Component of Income Taxes (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Income Tax Disclosure [Abstract] | |||
| Expected tax expense (benefit), at U.S. federal statutory income tax rate of 35% | $ 4,900 | $ (18,000) | $ 12,100 |
| Rate differences on equity in earnings (losses) of Kronos | (7,400) | (7,400) | (7,400) |
| Adjustment to the reserve for uncertain tax positions, net | (3,000) | ||
| U.S. state income taxes and other, net | (300) | (200) | 300 |
| Income tax expense (benefit) | $ (2,777) | $ (28,611) | $ 5,003 |