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Investments - Investments in Variable Interest Entities (Detail) (Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]
    
Variable Interest Entity [Line Items]    
Investment $ 710us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssetsAndLiabilitiesNet
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember		 [1] $ 7,329us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssetsAndLiabilitiesNet
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember		 [1]
Maximum Exposure to Loss $ 1,690us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember		 [1] $ 24,309us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember		 [1]
[1] In connection with the sale of eSpeed (see Note 2 "Divestiture"), the Company guaranteed all payment obligations of ELX through December 31, 2014 under the Amended and Restated Technology Services Agreement, dated as of March 28, 2012, by and between eSpeed Technology Services L.P. and ELX Futures L.P. In addition to its equity method investment, the Company has entered into a credit agreement to lend ELX up to $16.0 million. The commitment period for such credit facility extends through March 28, 2015. On December 23, 2014 the Company lent $5.0 million to ELX under this facility. Effective December 23, 2014 the Company consolidated ELX in its consolidated financial statements. Additionally, the Company has entered into a subordinated loan agreement with a VIE (Aqua), whereby the Company agreed to lend the principal sum of $980 thousand. As of December 31, 2014, the Company's maximum exposure to loss with respect to its VIEs is the sum of its equity investment in Aqua and the $980 thousand subordinated loan.