Amounts of Impairments Recorded and Presentation of Impairment Charges under Various Methods of Accounting (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2010
Impairment Costs [Line Items]
Impairment related and other	$ 728	[1]
Equity loss			2,914
Asset Impairment Charges, Total	$ 728		$ 2,914

[1] In addition to the $0.7 million of impairments recorded by GovDelivery in 2012 included in the table above, GovDelivery also recorded a $0.7 million gain with respect to the write-off of a certain contingent consideration liability which is also included in "Impairment related and other" on ICG's Consolidated Statements of Operations during the year ended December 31, 2012 but it is not included in the table above.