Employee Benefits - Pension and Other Defined Contribution Retirement Plan Expenses (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 530,000	$ 881,000	$ 2,299,000	$ 2,643,000
Interest cost on projected benefit obligation	6,349,000	5,740,000	18,812,000	17,222,000
Expected return on plan assets	(6,906,000)	(6,557,000)	(20,732,000)	(19,671,000)
Net amortization and deferrals	4,720,000	5,868,000	13,229,000	17,606,000
Net periodic benefit cost	4,693,000	5,932,000	13,608,000	17,800,000
Defined contribution and other retirement plans	1,964,000	1,585,000	5,866,000	5,531,000
Total expense	6,657,000	7,517,000	19,474,000	23,331,000
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	2,772,000	4,086,000	10,722,000	12,256,000
Interest cost on projected benefit obligation	8,298,000	7,718,000	25,250,000	23,204,000
Expected return on plan assets	(12,576,000)	(11,859,000)	(37,731,000)	(35,653,000)
Net amortization and deferrals	2,058,000	2,315,000	8,012,000	6,967,000
Loss due to settlements and special terminations	32,000	35,000	32,000	110,000
Net periodic benefit cost	584,000	2,295,000	6,285,000	6,884,000
Defined contribution and other retirement plans	1,886,000	1,548,000	4,508,000	2,838,000
Total expense	2,470,000	3,843,000	10,793,000	9,722,000
Maximum [Member] | Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to the plan			$ 21,000,000