Discontinued Operations (Summary of Assets and Liabilities) (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	May 31, 2012 DirectStar [Member]	Dec. 31, 2011 DirectStar [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]
Current assets	$ 18,591,000	$ 30,608,000	$ 43,100,000	$ 12,000,000	$ 9,800,000	$ 18,600,000	$ 20,800,000
Property and equipment, net				1,200,000	1,400,000	2,000,000	2,200,000
Goodwill and other intangible assets, net				104,000,000	101,200,000	0	6,400,000
Other long-term assets						5,700,000	10,500,000
Assets of discontinued operations				117,200,000	112,400,000	26,300,000	39,900,000
Accounts payable and accrued expenses				10,600,000	9,600,000	900,000	6,100,000
Other current liabilities, including accrued earn-outs				7,400,000	10,600,000	3,700,000	3,000,000
Liabilities of discontinued operations				$ 18,000,000	$ 20,200,000	$ 4,600,000	$ 9,100,000