Supplemental Financial Statement Information - Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 1,647,826
Ending balance	1,731,357	$ 1,404,023
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(52,770)	(254,148)
Other comprehensive income (loss)	46,785	40,084
Amounts reclassified from AOCI		267
Ending balance	(5,985)	(213,797)
Net Investment Hedge [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(4,981)
Other comprehensive income (loss)	(598)	(355)
Ending balance	(5,579)	(355)
Defined Benefit Plan Activity [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(28,852)	(33,473)
Amounts reclassified from AOCI	(1,432)	(369)
Ending balance	(30,284)	(33,842)
Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		2,508
Other comprehensive income (loss)		1,698
Amounts reclassified from AOCI		(389)
Ending balance		3,817
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(86,603)	(285,113)
Ending balance	$ (41,848)	$ (244,177)