Employee Benefits - Pension and Other Defined Contribution Retirement Plan Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Pension Plans [Member] | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 698	$ 771	$ 2,093	$ 2,314
Interest cost on projected benefit obligation	4,561	6,007	13,683	18,020
Expected return on plan assets	(9,246)	(8,069)	(27,737)	(24,208)
Net amortization and deferrals	1,793	1,387	5,377	4,159
Net periodic benefit (income) cost	(2,194)	96	(6,584)	285
Total (income) expense	(255)	1,307	134	6,108
Pension Plans [Member] | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	5,956	3,863	17,867	11,443
Interest cost on projected benefit obligation	4,066	6,372	12,198	18,890
Expected return on plan assets	(12,873)	(11,985)	(38,618)	(35,526)
Net amortization and deferrals	4,185	3,286	12,554	9,738
Net periodic benefit (income) cost	1,334	1,536	4,001	4,545
Total (income) expense	2,804	3,241	8,384	9,720
Defined Contribution and Other Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	221	214	663	644
Interest cost on projected benefit obligation	588	787	1,764	2,360
Net amortization and deferrals	(1,046)	(1,355)	(3,138)	(4,065)
Net periodic benefit (income) cost	(237)	(354)	(711)	(1,061)
Defined Contribution and Other Retirement Plans [Member] | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined contribution and other retirement plans	1,939	1,211	6,718	5,823
Defined Contribution and Other Retirement Plans [Member] | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined contribution and other retirement plans	$ 1,470	$ 1,705	$ 4,383	$ 5,175