Income Tax Effects Allocated to and Cumulative Balance of Accumulated Other Comprehensive Income (loss) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 1,408
Pretax Amount	(717)
Tax Effect	911
Net-of-Tax Amount	(1,628)
Ending Balance	(220)
Foreign currency translation adjustments and transfers from NCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	3,360
Pretax Amount	(4,418)
Tax Effect	112
Net-of-Tax Amount	(4,530)
Ending Balance	(1,170)
Unrealized gain on available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pretax Amount	2,344
Tax Effect	865
Net-of-Tax Amount	1,479
Ending Balance	1,479
Change in Accumulated OCI Related to postretirement healthcare plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,952)
Pretax Amount	1,357
Tax Effect	(66)
Net-of-Tax Amount	1,423
Ending Balance	$ (529)