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Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (216,281)	$ 1,567,258	$ 2,233,788
Other comprehensive income (loss), net of tax	1,528	(1,500)	(7,904)
Ending balance	232,144	(216,281)	1,567,258
Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(104,066)	(105,697)
Other comprehensive income (loss), net of tax	5,984	1,631
Ending balance	(98,082)	(104,066)	(105,697)
Unrealized Loss on Retirement Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(15,405)	(9,869)
Other comprehensive income (loss), net of tax	(4,456)	(5,536)
Ending balance	(19,861)	(15,405)	(9,869)
Unrealized Gain (Loss) on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	0	(2,405)
Other comprehensive income (loss), net of tax	0	2,405
Ending balance	0	0	(2,405)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(119,471)	(117,971)
Other comprehensive income (loss), net of tax	1,528	(1,500)
Ending balance	$ (117,943)	$ (119,471)	$ (117,971)

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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