Discontinued Operations (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2013 DirectStar [Member]	Jun. 30, 2012 DirectStar [Member]	Mar. 31, 2013 Globetec [Member]	Dec. 31, 2012 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 for a net sale price of $98.9 million in cash. DirectStar 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 approved 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 condensed unaudited consolidated balance sheets for all periods presented, and Globetec's results of operations are presented as discontinued operations in the condensed unaudited consolidated statements of operations for all periods presented.
Disposal date		Jun. 30, 2012
Net sale price			$ 98.9
Net assets of discontinued operations				25.3
Assets of discontinued operations				27.8	26.2
Liabilities of discontinued operations				2.5	4.6
Goodwill and intangible asset impairment, disposal group					6.4
Estimated losses on disposal, other					6.3
Depreciation and amortization, discontinued operations	$ 0.2