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Financial instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 58,945 $ 30,924
Cash and securities segregated for regulatory and other purposes 11,499 11,500
Deposits with clearing organization 9,095 9,095
Securities owned:    
Securities owned, at fair value 759,742 924,541
Investments 12,109  
Investments 258 26
Derivative contracts 3,057 2,421
TBAs 175 2,254
Total 176,940 74,116
Derivative contracts   20
TBAs 3,188 5,791
Securities purchased under agreements to resell   847,610
Total 902,988 1,876,439
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 173,450 69,415
Other [Member]
    
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 425 122
U.S. Treasury obligations [Member]
    
Securities owned:    
Securities owned, at fair value 497,546 627,870
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 131,899 27,462
U.S. Agency obligations [Member]
    
Securities owned:    
Securities owned, at fair value 27,690 54,358
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 31 47
Sovereign obligations [Member]
    
Securities owned:    
Securities owned, at fair value 19 577
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value     
Corporate debt and other obligations [Member]
    
Securities owned:    
Securities owned, at fair value 14,428 27,188
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 1,858 3,696
Mortgage and other asset-backed securities [Member]
    
Securities owned:    
Securities owned, at fair value 2,920 4,609
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 18 14
Municipal obligations [Member]
    
Securities owned:    
Securities owned, at fair value 59,010 54,963
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 467 485
Convertible bonds [Member]
    
Securities owned:    
Securities owned, at fair value 49,130 50,157
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 8,868 8,533
Corporate Securities [Member]
    
Securities owned:    
Securities owned, at fair value 43,708 38,634
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 29,884 29,056
Other [Member]
    
Securities owned:    
Securities owned, at fair value 65,291 66,185
Other [Member]
    
Securities owned:    
Investments 60,519 46,958
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 58,945 30,924
Cash and securities segregated for regulatory and other purposes 11,499 11,500
Deposits with clearing organization 9,095 9,095
Securities owned:    
Securities owned, at fair value 534,291 703,405
Investments 258 26
Derivative contracts 286 66
Total 153,714 44,093
Total 624,307 756,436
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 153,170 44,001
Level 1 [Member] | Other [Member]
    
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 325 72
Level 1 [Member] | U.S. Treasury obligations [Member]
    
Securities owned:    
Securities owned, at fair value 497,546 627,870
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 131,899 27,462
Level 1 [Member] | U.S. Agency obligations [Member]
    
Securities owned:    
Securities owned, at fair value   32,663
Level 1 [Member] | Sovereign obligations [Member]
    
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value     
Level 1 [Member] | Corporate debt and other obligations [Member]
    
Securities owned:    
Securities owned, at fair value 2,459 12,538
Level 1 [Member] | Corporate Securities [Member]
    
Securities owned:    
Securities owned, at fair value 31,958 29,150
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 20,946 16,467
Level 1 [Member] | Other [Member]
    
Securities owned:    
Securities owned, at fair value 2,328 1,184
Level 1 [Member] | Other [Member]
    
Securities owned:    
Investments 10,477 1,512
Level 2 [Member]
    
Securities owned:    
Securities owned, at fair value 153,054 152,557
Derivative contracts 124 8
TBAs 175 2,254
Total 20,479 27,626
Derivative contracts   20
TBAs 3,188 5,791
Securities purchased under agreements to resell   847,610
Total 193,330 1,038,942
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 20,180 25,364
Level 2 [Member] | U.S. Agency obligations [Member]
    
Securities owned:    
Securities owned, at fair value 27,690 21,695
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 31 47
Level 2 [Member] | Sovereign obligations [Member]
    
Securities owned:    
Securities owned, at fair value 19 577
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value     
Level 2 [Member] | Corporate debt and other obligations [Member]
    
Securities owned:    
Securities owned, at fair value 11,969 14,650
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 1,858 3,696
Level 2 [Member] | Mortgage and other asset-backed securities [Member]
    
Securities owned:    
Securities owned, at fair value 2,880 4,593
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 18 14
Level 2 [Member] | Municipal obligations [Member]
    
Securities owned:    
Securities owned, at fair value 49,616 51,401
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 467 485
Level 2 [Member] | Convertible bonds [Member]
    
Securities owned:    
Securities owned, at fair value 49,130 50,157
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 8,868 8,533
Level 2 [Member] | Corporate Securities [Member]
    
Securities owned:    
Securities owned, at fair value 11,750 9,484
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 8,938 12,589
Level 2 [Member] | Other [Member]
    
Securities owned:    
Investments 37,088 32,964
Level 3 [Member]
    
Securities owned:    
Securities owned, at fair value 72,397 68,579
Derivative contracts 2,647 2,347
Total 2,747 2,397
Total 85,351 81,061
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 100 50
Level 3 [Member] | Other [Member]
    
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value 100 50
Level 3 [Member] | Sovereign obligations [Member]
    
Securities sold, not yet purchased:    
Securities sold, but not yet purchased at fair value     
Level 3 [Member] | Mortgage and other asset-backed securities [Member]
    
Securities owned:    
Securities owned, at fair value 40 16
Level 3 [Member] | Municipal obligations [Member]
    
Securities owned:    
Securities owned, at fair value 9,394 3,562
Level 3 [Member] | Other [Member]
    
Securities owned:    
Securities owned, at fair value 62,963 65,001
Level 3 [Member] | Other [Member]
    
Securities owned:    
Investments $ 12,954 $ 12,482