Reconciliation Assets Measured at Fair Value on a Recurring Basis Using Unobservable Inputs (Level 3) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Corporate Bond Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 66,024
Unrealized Loss Reported in AOCI	(16,577)
Effect of exchange rate changes	(1,597)
Ending Balance	47,850
DIO Equity Option Contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	0
Additions/Purchases, gross	786
Unrealized Gain Reported in other expense (income), net	(388)
Effect of exchange rate changes	21
Ending Balance	419
Contingent Considerations On Acquisitions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	5,887
Payments/sales, gross	(2,989)
Effect of exchange rate changes	19
Ending Balance	$ 2,917