Stockholder's Equity - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Components Of Other Comprehensive Income Loss [Line Items] |
|
|
|
| Balance at beginning of year |
$ 149,950
|
|
|
| Other comprehensive income (loss) |
12,512
|
$ (63,319)
|
$ (147,023)
|
| Balance at end of year |
177,920
|
149,950
|
|
| Marketable Securities |
|
|
|
| Components Of Other Comprehensive Income Loss [Line Items] |
|
|
|
| Balance at beginning of year |
195
|
47,112
|
154,169
|
| Other comprehensive income (loss) |
20,278
|
(48,647)
|
(107,057)
|
| Reclassification adjustment for amounts included in realized loss and equity in earnings |
|
1,730
|
|
| Balance at end of year |
20,473
|
195
|
47,112
|
| Currency Translation |
|
|
|
| Components Of Other Comprehensive Income Loss [Line Items] |
|
|
|
| Balance at beginning of year |
(172,384)
|
(154,173)
|
(133,816)
|
| Other comprehensive income (loss) |
(3,475)
|
(18,211)
|
(20,357)
|
| Balance at end of year |
(175,859)
|
(172,384)
|
(154,173)
|
| Interest Rate Swap | Kronos |
|
|
|
| Components Of Other Comprehensive Income Loss [Line Items] |
|
|
|
| Balance at beginning of year |
(445)
|
|
|
| Other comprehensive income (loss) |
(393)
|
(560)
|
|
| Reclassification adjustment for amounts included in realized loss and equity in earnings |
448
|
115
|
|
| Balance at end of year |
(390)
|
(445)
|
|
| Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans |
|
|
|
| Components Of Other Comprehensive Income Loss [Line Items] |
|
|
|
| Balance at beginning of year |
(72,712)
|
(75,260)
|
(56,644)
|
| Other comprehensive income (loss) |
2,655
|
2,884
|
2,107
|
| Net actuarial gain (loss) arising during year |
(6,653)
|
(336)
|
(20,723)
|
| Balance at end of year |
(76,710)
|
(72,712)
|
(75,260)
|
| Accumulated Defined Benefit Plans Adjustment | OPEB |
|
|
|
| Components Of Other Comprehensive Income Loss [Line Items] |
|
|
|
| Balance at beginning of year |
(12)
|
282
|
1,275
|
| Other comprehensive income (loss) |
(529)
|
(547)
|
(626)
|
| Net actuarial gain (loss) arising during year |
181
|
253
|
(367)
|
| Balance at end of year |
(360)
|
(12)
|
282
|
| Total Accumulated Other Comprehensive Income (Loss), Net of Tax |
|
|
|
| Components Of Other Comprehensive Income Loss [Line Items] |
|
|
|
| Balance at beginning of year |
(245,358)
|
(182,039)
|
(35,016)
|
| Balance at end of year |
$ (232,846)
|
$ (245,358)
|
$ (182,039)
|