Stockholder's Equity - Schedule of Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components Of Other Comprehensive Income Loss [Line Items]
Marketable securities, Balance at beginning of year	$ 47,112	$ 154,169	$ 105,419
Unrealized gain (loss) arising during the year	(48,647)	(107,057)	48,514
Less reclassification adjustment for amounts included in realized loss	1,730		236
Marketable securities, Balance at end of year	195	47,112	154,169
Currency translation, Balance at beginning of year	(154,173)	(133,816)	(135,165)
Arising during the year	(18,211)	(20,357)	1,349
Currency translation, Balance at end of year	(172,384)	(154,173)	(133,816)
Interest rate swap	(445)
Interest rate swap, Balance at end of year	(445)
Balance at beginning of year	(182,039)	(35,016)	(95,253)
Other comprehensive income (loss)	(63,319)	(147,023)	60,237
Balance at end of year	(245,358)	(182,039)	(35,016)
Defined Benefit Pension Plans
Components Of Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	(75,260)	(56,644)	(66,402)
Amortization of prior service cost and net losses included in net periodic pension cost	2,884	2,107	2,776
Net actuarial gain (loss) arising during year	(336)	(20,723)	5,952
Plan curtailment			1,030
Balance at end of year	(72,712)	(75,260)	(56,644)
OPEB
Components Of Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	282	1,275	895
Amortization of prior service cost and net losses included in net periodic pension cost	(547)	(626)	(663)
Net actuarial gain (loss) arising during year	253	(367)	395
Plan amendment			648
Balance at end of year	$ (12)	$ 282	$ 1,275