Stockholders' Equity - Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 717,878	$ 1,113,104	$ 970,093	$ 1,258,905
Other comprehensive income (loss) before reclassifications	(17,710)	(7,813)	(18,122)	(30,634)
Adjustments for items reclassified to earnings, net of tax	1,074	949	3,319	2,788
OTHER COMPREHENSIVE LOSS, NET OF TAX	(16,636)	(6,864)	(14,803)	(27,846)
Balance	686,221	1,121,585	686,221	1,121,585
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(133,410)	(109,642)	(130,137)	(83,535)
Other comprehensive income (loss) before reclassifications	(26,760)	(8,676)	(30,033)	(34,783)
Adjustments for items reclassified to earnings, net of tax	0	0	0	0
OTHER COMPREHENSIVE LOSS, NET OF TAX	(26,760)	(8,676)	(30,033)	(34,783)
Balance	(160,170)	(118,318)	(160,170)	(118,318)
Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(138,577)	(143,859)	(143,683)	(148,984)
Other comprehensive income (loss) before reclassifications	9,050	863	11,911	4,149
Adjustments for items reclassified to earnings, net of tax	1,074	949	3,319	2,788
OTHER COMPREHENSIVE LOSS, NET OF TAX	10,124	1,812	15,230	6,937
Balance	(128,453)	(142,047)	(128,453)	(142,047)
AOCI Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(3)	(2)	(2)	(1)
Other comprehensive income (loss) before reclassifications	1	2		1
OTHER COMPREHENSIVE LOSS, NET OF TAX	1	2		1
Balance	(2)		(2)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(271,984)	(253,499)	(273,818)	(232,518)
Other comprehensive income (loss) before reclassifications	(17,711)	(7,815)	(18,122)	(30,635)
Adjustments for items reclassified to earnings, net of tax	1,074	949	3,319	2,788
OTHER COMPREHENSIVE LOSS, NET OF TAX	(16,637)	(6,866)	(14,803)	(27,847)
Balance	(288,621)	(260,365)	(288,621)	(260,365)
Total AOCI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(271,987)	(253,501)	(273,820)	(232,519)
Balance	$ (288,623)	$ (260,365)	$ (288,623)	$ (260,365)