Summarized Financial Information Related to Companies Accounted for Under Equity Method of Accounting (Parenthetical) (Detail)	Dec. 31, 2013	Dec. 31, 2012
Acquirgy
Schedule Of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	25.00%	25.00%
Channel Intelligence
Schedule Of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	38.00%
Freeborders
Schedule Of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		31.00%
WhiteFence
Schedule Of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		36.00%