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Restructuring and Other Charges (Detail) (USD $)	3 Months Ended		12 Months Ended				3 Months Ended
Restructuring and Other Charges (Detail) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012 All Other Segments [Member] Restructuring Reserve 2012 [Member]	Dec. 31, 2012 The Deal, LLC [Member] Restructuring Reserve 2012 [Member]	Dec. 31, 2009 Restructuring Reserve 2009 [Member]	Dec. 31, 2011 Restructuring Reserve 2011 [Member]	Mar. 31, 2013 Restructuring Reserve 2012 [Member]	Mar. 31, 2012 Restructuring Reserve 2012 [Member]
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent					8.00%
Restructuring Charges	$ 385,610	$ 1,713,498	$ 3,400,000	$ 3,500,000	$ 3,500,000	$ 1,800,000	$ 0	$ 1,713,498

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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