Discontinued Operations (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		6 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012 DirectStar Business [Member]	Sep. 30, 2012 DirectStar Business [Member]	May 31, 2012 DirectStar Business [Member]	Dec. 31, 2011 DirectStar Business [Member]	Sep. 30, 2012 Globetec [Member]	Sep. 30, 2012 Globetec [Member]	Dec. 31, 2011 Globetec [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net assets of discontinued operations									$ 20.6	$ 20.6
Assets of discontinued operations							117.2	112.4	25.9	25.9	39.9
Liabilities of discontinued operations							18.0	20.2	5.3	5.3	9.1
Impairment of long-lived assets to be disposed of									6.4
Other asset impairment charges, disposal group									6.3
Disposal date					Jun. 30, 2012
Net purchase price, sale of business					98.9
Discontinued operations description						In May 2012, Red Ventures exercised its option to acquire from the Company all of the issued and outstanding equity interests in DirectStar, which provides marketing and sales services on behalf of DIRECTV®. The sale of DirectStar to Red Ventures was consummated in June 2012. The Company sold DirectStar for a net purchase price of $98.9 million in cash. The DirectStar Business is presented as a discontinued operation in the Company’s condensed unaudited consolidated financial statements for all periods presented.				In September 2012, the Company's board of directors voted to approve a plan of sale for substantially all of the projects and assets of Globetec. The decision to sell was made after evaluation of, among other things, short and long-term prospects of the Globetec operation. Accordingly, Globetec's projects and assets are reflected as assets and liabilities of discontinued operations in the condensed unaudited consolidated balance sheets for all periods presented, and Globetec's results of operations are presented as discontinued operations in the condensed unaudited statements of operations for all periods presented.
Depreciation and amortization expense, discontinued operations	$ 0.2	$ 0.3	$ 0.6	$ 0.8