Summarized Financial Information Related to Companies Accounted for Under Equity Method of Accounting (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Cash and cash equivalents and Other current assets	$ 11,268	[1]	$ 28,767	[2]
Non-current assets	13,218	[1]	69,218	[2]
Total assets	30,058	[1]	111,672	[2]
Current liabilities	21,115	[1]	47,125	[2]
Non-current liabilities and Long-term debt	1,397	[1]	10,770	[2]
Stockholders' equity	(5,124)	[1]	34,818	[2]
Total liabilities and stockholders' equity	30,058	[1]	111,672	[2]
Total carrying value	13,333	[1]	39,052	[2]
Cash and Cash Equivalents
Schedule of Equity Method Investments [Line Items]
Cash and cash equivalents and Other current assets	5,572	[1]	13,687	[2]
Long-term Debt
Schedule of Equity Method Investments [Line Items]
Non-current liabilities and Long-term debt	$ 12,670	[1]	$ 18,959	[2]

[1] Includes (ICG voting ownership): Acquirgy (25%), Freeborders (31%) and WhiteFence (36%).

[2] Includes (ICG voting ownership): Acquirgy (25%), CIML (49%), Freeborders (31%), GoIndustry (26%), SeaPass (26%) and WhiteFence (36%).