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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 376	$ 323	$ 751	$ 645
Interest cost	937	1,053	1,875	2,106
Expected return on plan assets	(1,248)	(1,408)	(2,496)	(2,816)
Net amortization	855	674	1,679	1,374
Net periodic benefit cost	920	642	1,809	1,309
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	376	392	757	766
Interest cost	433	605	868	1,204
Expected return on plan assets	(280)	(329)	(556)	(657)
Net amortization	470	219	929	439
Net periodic benefit cost	999	887	1,998	1,752
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	169	179	338	357
Interest cost	209	233	418	466
Net amortization	(111)	(119)	(219)	(237)
Net periodic benefit cost	$ 267	$ 293	$ 537	$ 586