Summary of Warrants to Purchase Common Stock (Detail) (Warburg Pincus)	Jun. 30, 2011
Warrants Issued January 29, 2009
Class of Warrant or Right [Line Items]
Issuance Date	Jan. 29, 2009
Price per Share	11.57
Total Shares	3,862,422
Expiration Date	Jan. 29, 2013
Warrants Issued May 20, 2008
Class of Warrant or Right [Line Items]
Issuance Date	May 20, 2008
Price per Share	20.00
Total Shares	3,700,000
Expiration Date	May 20, 2012

Class of Warrant or Right, Expiry Date of Warrants or Rights Exercisable

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- Definition

Class of Warrant or Right, Issuance Date of Warrants or Rights Exercisable

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- Definition

The exercise price of each class of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph i
-Subparagraph 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Aggregate amount of each class of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph i

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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