Acquisitions - Fair Value of Consideration Transferred (Detail) (HandyLab, Inc [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
HandyLab, Inc [Member]
Business Acquisition [Line Items]
Cash	$ 274,756
Settlement of preexisting relationship	2,854
Net assets acquired	$ 277,610

This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs.

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