Stockholder's Equity - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	$ 284,115
Net change in balance during year	(40)	$ (162)	$ (28)
Balance at end of year	304,506	284,115
Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	(172,434)	(164,467)	(175,859)
Other comprehensive income (loss)	(409)	(7,967)	11,392
Balance at end of year	(172,843)	(172,434)	(164,467)
Marketable Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of year		46,069	20,473
Change in accounting principle-ASU 2016-01		(46,069)
Balance at beginning of year, as adjusted			20,473
Other comprehensive income (loss) - unrealized gain (loss) arising during the year			25,596
Balance at end of year			46,069
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	(75,286)	(72,951)	(76,710)
Other comprehensive income (loss)	3,539	(2,335)	2,956
Net actuarial gain (loss) arising during year	(6,510)		803
Balance at end of year	(78,257)	(75,286)	(72,951)
Interest Rate Swap | Kronos
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of year			(390)
Other comprehensive income (loss) - unrealized gain (loss) arising during the year			(296)
Reclassification adjustment for amounts included in realized loss and equity in earnings			686
Other
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	(550)	(388)	(360)
Net change in balance during year	(40)	(162)	(28)
Balance at end of year	(590)	(550)	(388)
Total Accumulated Other Comprehensive Income (Loss), Net of Tax
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	(248,270)	(191,737)	(232,846)
Change in accounting principle-ASU 2016-01		(46,069)
Balance at beginning of year, as adjusted	(248,270)	(237,806)	(232,846)
Other comprehensive income (loss)	(3,420)	(10,464)	41,109
Balance at end of year	$ (251,690)	$ (248,270)	$ (191,737)