Discontinued Operations (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended			6 Months Ended	12 Months Ended			9 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2012 DirectStar [Member]	Dec. 31, 2012 DirectStar [Member]	May 31, 2012 DirectStar [Member]	Dec. 31, 2011 DirectStar [Member]	Sep. 30, 2012 Globetec [Member]	Dec. 31, 2012 Globetec [Member]	Dec. 31, 2011 Globetec [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
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 sale price of $98.9 million in cash. The DirectStar Business is presented as a discontinued operation in the Company’s consolidated financial statements for all periods presented.			In September 2012, the Company's board of directors voted to approve a plan of sale for its Globetec business. 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 consolidated balance sheets for all periods presented, and Globetec's results of operations are presented as discontinued operations in the consolidated statements of operations for all periods presented.
Disposal date					Jun. 30, 2012
Net purchase price, sale of business				$ 98.9
Net assets of discontinued operations									21.7
Assets of discontinued operations						117.2	112.4		26.3	39.9
Liabilities of discontinued operations						18.0	20.2		4.6	9.1
Goodwill and intangible asset impairment, disposal group									6.4
Other asset impairment charges, disposal group									6.3
Depreciation and amortization expense, discontinued operations	$ 0.6	$ 1.1	$ 0.9