Retirement Benefits (Components of Net Periodic Benefit Cost for Defined Benefit Plans and Other Postretirement Plans) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 375	$ 323
Interest cost	938	1,053
Expected return on plan assets	(1,248)	(1,408)
Net amortization	824	699
Net periodic benefit cost	889	667
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	381	374
Interest cost	435	599
Expected return on plan assets	(276)	(327)
Net amortization	459	219
Net periodic benefit cost	999	865
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	169	178
Interest cost	209	233
Net amortization	(108)	(118)
Net periodic benefit cost	$ 270	$ 293