Retirement Benefits (Components of Net Periodic Benefit Cost for Defined Benefit Plans and Other Postretirement Plans) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 214	$ 227	$ 965	$ 872
Interest cost	956	896	2,831	3,002
Expected return on plan assets	(1,186)	(1,219)	(3,682)	(4,035)
Net amortization	906	590	2,585	1,964
Net periodic benefit cost	890	494	2,699	1,803
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	377	377	1,134	1,143
Interest cost	437	593	1,305	1,797
Expected return on plan assets	(282)	(329)	(838)	(986)
Net amortization	405	394	1,334	833
Net periodic benefit cost	937	1,035	2,935	2,787
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	168	178	506	535
Interest cost	208	233	626	699
Net amortization	(95)	(118)	(314)	(355)
Net periodic benefit cost	$ 281	$ 293	$ 818	$ 879