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Stockholders Equity - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period			$ 311,877
Balance at end of period	$ 336,301		336,301
Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(169,030)	$ (182,961)	(169,575)	$ (172,843)
Other comprehensive income (loss)	402	4,364	947	(5,754)
Balance at end of period	(168,628)	(178,597)	(168,628)	(178,597)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(79,553)	(77,214)	(80,704)	(78,257)
Other comprehensive income (loss)	1,144	1,031	2,295	2,074
Balance at end of period	(78,409)	(76,183)	(78,409)	(76,183)
Accumulated Defined Benefit Plans Adjustment | OPEB
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(981)	(670)	(910)	(590)
Other comprehensive income (loss)	(64)	(71)	(135)	(151)
Balance at end of period	(1,045)	(741)	(1,045)	(741)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(249,564)	(260,845)	(251,189)	(251,690)
Other comprehensive income (loss)	1,482	5,324	3,107	(3,831)
Balance at end of period	$ (248,082)	$ (255,521)	$ (248,082)	$ (255,521)

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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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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