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Legal Proceedings - Additional Information (Detail) (USD $)	Mar. 31, 2013
CONSOB
Loss Contingencies [Line Items]
Range of possible loss, minimum	$ 6,000
Range of possible loss, maximum	641,000
VAT Assessments
Loss Contingencies [Line Items]
Range of possible loss, maximum	$ 12,100,000

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.