Stockholders' Equity - Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 1,293,813	$ 1,367,306	$ 770,057
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	81,705	(79,867)	(33,590)
Balance	1,258,905	1,293,813	1,367,306
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(155,204)	(97,284)	(46,102)
Other comprehensive income (loss) before reclassifications	71,669	(57,920)	(51,182)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	71,669	(57,920)	(51,182)
Balance	(83,535)	(155,204)	(97,284)
Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(159,020)	(137,073)	(154,665)
Other comprehensive income (loss) before reclassifications	2,085	(24,473)	11,283
Adjustments for items reclassified to earnings, net of tax	7,951	2,526	6,309
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	10,036	(21,947)	17,592
Balance	(148,984)	(159,020)	(137,073)
Total AOCI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(314,224)	(234,357)	(200,767)
Other comprehensive income (loss) before reclassifications	73,754	(82,393)	(39,899)
Adjustments for items reclassified to earnings, net of tax	7,951	2,526	6,309
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	81,705	(79,867)	(33,590)
Balance	(232,519)	(314,224)	(234,357)
AOCI Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(2)	(1)	(1)
Other comprehensive income (loss) before reclassifications	1	(1)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	1	(1)
Balance	(1)	(2)	(1)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(314,222)	(234,356)	(200,766)
Other comprehensive income (loss) before reclassifications	73,753	(82,392)	(39,899)
Adjustments for items reclassified to earnings, net of tax	7,951	2,526	6,309
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	81,704	(79,866)	(33,590)
Balance	$ (232,518)	$ (314,222)	$ (234,356)