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Fair Value Measurements (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011	Jun. 30, 2012	Dec. 31, 2011
Intangible asset impairment charge	$ 14,800	$ (14,830)	$ 14,830	$ 14,800
Precentage of control premium for valuing assets				15.00%
Minimum
Percentage of weighted average cost of capital rates after tax				10.00%
Maximum
Percentage of weighted average cost of capital rates after tax				20.00%

X

- Definition

Weighted Average Cost Of Capital Rate

+ References

No definition available.

+ Details

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X

- Definition

Percentage above current market value that an investor seeking to acquire control of a company will pay, used as an input to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16373-109275



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 46

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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