Stockholder's Equity - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components Of Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	$ 335,322
Net change in balance during year	(162)	$ (28)	$ (348)
Balance at end of year	284,115	335,322
Marketable Securities
Components Of Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	46,069	20,473	195
Change in accounting principle-ASU 2016-01	(46,069)
Balance at beginning of year, as adjusted		20,473	195
Other comprehensive income (loss) - unrealized gain (loss) arising during the year		25,596	20,278
Balance at end of year		46,069	20,473
Currency Translation
Components Of Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	(164,467)	(175,859)	(172,384)
Other comprehensive income (loss)	(7,967)	11,392	(3,475)
Balance at end of year	(172,434)	(164,467)	(175,859)
Interest Rate Swap | Kronos
Components Of Other Comprehensive Income Loss [Line Items]
Balance at beginning of year		(390)	(445)
Other comprehensive income (loss) - unrealized gain (loss) arising during the year		(296)	(393)
Reclassification adjustment for amounts included in realized loss and equity in earnings		686	448
Balance at end of year			(390)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans
Components Of Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	(72,951)	(76,710)	(72,712)
Other comprehensive income (loss)	(2,335)	2,956	2,655
Net actuarial gain (loss) arising during year		803	(6,653)
Balance at end of year	(75,286)	(72,951)	(76,710)
Other
Components Of Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	(388)	(360)	(12)
Net change in balance during year	(162)	(28)	(348)
Balance at end of year	(550)	(388)	(360)
Total Accumulated Other Comprehensive Income (Loss), Net of Tax
Components Of Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	(191,737)	(232,846)	(245,358)
Change in accounting principle-ASU 2016-01	(46,069)
Balance at beginning of year, as adjusted	(237,806)	(232,846)	(245,358)
Other comprehensive income (loss)	(10,464)	41,109	12,512
Balance at end of year	$ (248,270)	$ (191,737)	$ (232,846)