Employee Benefits - Plan Assets and Benefit Obligations of Defined Benefit Pension Plans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 3,057	$ 3,644	$ 3,121
Interest cost on projected benefit obligation	25,090	23,284	24,314
Expected return on plan assets	(27,647)	(26,320)	(24,329)
Net amortization of deferrals	17,656	24,600	20,180
Settlements and curtailments	0	0	0
Net periodic benefit cost	18,156	25,208	23,286
Defined contribution and other retirement plans	7,854	7,326	7,039
Total expense	26,010	32,534	30,325
Net actuarial loss (gain)	50,918	(39,754)
Recognized actuarial loss	(17,345)	(24,296)
Prior service cost	216	0
Recognized prior service cost	(311)	(304)
Currency translation adjustment	0	0
Total recognized in OCI (before tax effects)	33,478	(64,354)
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	14,142	16,423	12,585
Interest cost on projected benefit obligation	33,360	31,103	30,944
Expected return on plan assets	(49,861)	(47,793)	(43,728)
Net amortization of deferrals	10,584	9,337	6,443
Settlements and curtailments	43	215	873
Net periodic benefit cost	8,268	9,285	7,117
Defined contribution and other retirement plans	6,323	4,094	4,837
Total expense	14,591	13,379	11,954
Net actuarial loss (gain)	138,652	36,134
Recognized actuarial loss	(10,874)	(9,536)
Prior service cost	(10,814)	(873)
Recognized prior service cost	248	(15)
Currency translation adjustment	(30,441)	5,464
Total recognized in OCI (before tax effects)	$ 86,771	$ 31,174