Retirement Benefits (Components of Net Periodic Benefit Cost for Defined Benefit Plans and Other Postretirement Plans) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 294	$ 375
Interest cost	747	938
Expected return on plan assets	(1,175)	(1,248)
Net amortization	827	824
Net periodic benefit cost	693	889
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	299	381
Interest cost	350	435
Expected return on plan assets	(219)	(276)
Net amortization	238	459
Net periodic benefit cost	668	999
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	132	169
Interest cost	174	209
Net amortization	(154)	(108)
Net periodic benefit cost	$ 152	$ 270