Leucadia and Related Transactions - Summary Computation of Purchase Price and Fair Values Assigned to Assets and Liabilities (Detail) - Leucadia [Member] $ / shares in Units, $ in Thousands	Mar. 01, 2013 USD ($) $ / shares shares
Business Acquisition [Line Items]
Jefferies common stock outstanding	205,368,031
Less: Jefferies common stock owned by Leucadia	(58,006,024)
Jefferies common stock acquired by Leucadia	147,362,007
Exchange ratio	0.81
Leucadia’s shares issued (excluding for Jefferies shares held by Leucadia)	119,363,225.67
Less: restricted shares issued for share-based payment awards	(6,894,856)
Leucadia’s shares issued, excluding share-based payment awards	112,468,370
Closing price of Leucadia's common stock | $ / shares	$ 26.90
Fair value of common shares acquired by Leucadia | $	$ 3,025,399
Fair value of 3.25% cumulative convertible preferred shares | $	125,000
Fair value of shares-based payment awards | $	343,811
Fair value of Jefferies shares owned by Leucadia | $	1,259,891
Total purchase price | $	$ 4,754,101