Retirement Benefits (Components of Net Periodic Benefit Cost for Defined Benefit Plans and Other Postretirement Plans) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 294	$ 376	$ 588	$ 751
Interest cost	747	937	1,494	1,875
Expected return on plan assets	(1,175)	(1,248)	(2,350)	(2,496)
Net amortization	827	855	1,654	1,679
Net periodic benefit cost	693	920	1,386	1,809
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	304	376	603	757
Interest cost	355	433	705	868
Expected return on plan assets	(220)	(280)	(439)	(556)
Net amortization	243	470	481	929
Net periodic benefit cost	682	999	1,350	1,998
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	181	169	313	338
Interest cost	224	209	398	418
Net amortization	(154)	(111)	(308)	(219)
Net periodic benefit cost	$ 251	$ 267	$ 403	$ 537