Acquisition of Assets - Additional Information (Detail) (Avid Health, Inc, USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2013
Business Acquisition [Line Items]
Date of business acquisition	Oct. 01, 2012
Adjusted Acquisition Date Fair Value
Business Acquisition [Line Items]
Purchase price	$ 652.8

Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant