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)