Stockholders Equity - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period			$ 311,877
Balance at end of period	$ 342,895		342,895
Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(168,628)	$ (178,597)	(169,575)	$ (172,843)
Other comprehensive income (loss)	(1,859)	2,426	(912)	(3,328)
Balance at end of period	(170,487)	(176,171)	(170,487)	(176,171)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(78,409)	(76,183)	(80,704)	(78,257)
Other comprehensive income (loss)	1,133	1,075	3,428	3,149
Balance at end of period	(77,276)	(75,108)	(77,276)	(75,108)
Accumulated Defined Benefit Plans Adjustment | OPEB
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(1,045)	(741)	(910)	(590)
Other comprehensive income (loss)	(65)	(70)	(200)	(221)
Balance at end of period	(1,110)	(811)	(1,110)	(811)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(248,082)	(255,521)	(251,189)	(251,690)
Other comprehensive income (loss)	(791)	3,431	2,316	(400)
Balance at end of period	$ (248,873)	$ (252,090)	$ (248,873)	$ (252,090)