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Financial instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | $ 50,909 | $ 58,945
Securities segregated for regulatory and other purposes | 17,092 | 11,499
Deposits with clearing organizations | 3,499 | 9,095
Securities owned |  |
Securities owned, at fair value | 848,329 | 759,742
Investments | 11,919 |
TBAs | 3,111 | 3,188
Total | 978,477 | 902,988
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 63,046 | 173,450
Investments | 270 | 258
Derivative contracts | 2,525 | 3,057
TBAs | 281 | 175
Total | 66,122 | 176,940
Corporate equities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 42,091 | 43,708
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 34,401 | 29,884
Other [Member] |  |
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 114 | 425
U.S. Treasury obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 571,923 | 497,546
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 12,290 | 131,899
U.S. Agency obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 39,584 | 27,690
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 30 | 31
Sovereign obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 803 | 19
Corporate debt and other obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 20,577 | 14,428
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 6,811 | 1,858
Mortgage and other asset-backed securities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 3,385 | 2,920
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 25 | 18
Municipal obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 61,551 | 59,010
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 556 | 467
Convertible bonds [Member] |  |
Securities owned |  |
Securities owned, at fair value | 43,871 | 49,130
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 8,819 | 8,868
Other [Member] |  |
Securities owned |  |
Securities owned, at fair value | 64,544 | 65,291
Other [Member] |  |
Securities owned |  |
Investments | 55,537 | 60,519
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 50,909 | 58,945
Securities segregated for regulatory and other purposes | 17,092 | 11,499
Deposits with clearing organizations | 3,499 | 9,095
Securities owned |  |
Securities owned, at fair value | 617,744 | 534,291
TBAs |  |
Total | 690,180 | 624,307
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 30,156 | 153,170
Investments | 270 | 258
Derivative contracts | 360 | 286
TBAs |  |
Total | 30,786 | 153,714
Level 1 [Member] | Corporate equities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 30,333 | 31,958
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 17,852 | 20,946
Level 1 [Member] | Other [Member] |  |
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 14 | 325
Level 1 [Member] | U.S. Treasury obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 571,923 | 497,546
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 12,290 | 131,899
Level 1 [Member] | U.S. Agency obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 10,859 |
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  |
Level 1 [Member] | Sovereign obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value |  |
Level 1 [Member] | Corporate debt and other obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 2,574 | 2,459
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  |
Level 1 [Member] | Mortgage and other asset-backed securities [Member] |  |
Securities owned |  |
Securities owned, at fair value |  |
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  |
Level 1 [Member] | Municipal obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value |  |
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  |
Level 1 [Member] | Convertible bonds [Member] |  |
Securities owned |  |
Securities owned, at fair value |  |
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  |
Level 1 [Member] | Other [Member] |  |
Securities owned |  |
Securities owned, at fair value | 2,055 | 2,328
Level 1 [Member] | Other [Member] |  |
Securities owned |  |
Investments | 936 | 10,477
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents |  |
Securities segregated for regulatory and other purposes |  |
Deposits with clearing organizations |  |
Securities owned |  |
Securities owned, at fair value | 157,741 | 153,054
TBAs | 3,111 | 3,188
Total | 202,674 | 193,330
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 32,790 | 20,180
Investments |  |
Derivative contracts | 71 | 124
TBAs | 281 | 175
Total | 33,142 | 20,479
Level 2 [Member] | Corporate equities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 11,758 | 11,750
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 16,549 | 8,938
Level 2 [Member] | Other [Member] |  |
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  |
Level 2 [Member] | U.S. Treasury obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value |  |
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  |
Level 2 [Member] | U.S. Agency obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 28,725 | 27,690
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 30 | 31
Level 2 [Member] | Sovereign obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 803 | 19
Level 2 [Member] | Corporate debt and other obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 18,003 | 11,969
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 6,811 | 1,858
Level 2 [Member] | Mortgage and other asset-backed securities [Member] |  |
Securities owned |  |
Securities owned, at fair value | 3,333 | 2,880
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 25 | 18
Level 2 [Member] | Municipal obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 51,248 | 49,616
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 556 | 467
Level 2 [Member] | Convertible bonds [Member] |  |
Securities owned |  |
Securities owned, at fair value | 43,871 | 49,130
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 8,819 | 8,868
Level 2 [Member] | Other [Member] |  |
Securities owned |  |
Securities owned, at fair value |  |
Level 2 [Member] | Other [Member] |  |
Securities owned |  |
Investments | 41,822 | 37,088
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents |  |
Securities segregated for regulatory and other purposes |  |
Deposits with clearing organizations |  |
Securities owned |  |
Securities owned, at fair value | 72,844 | 72,397
TBAs |  |
Total | 85,623 | 85,351
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 100 | 100
Investments |  |
Derivative contracts | 2,094 | 2,647
TBAs |  |
Total | 2,194 | 2,747
Level 3 [Member] | Corporate equities [Member] |  |
Securities owned |  |
Securities owned, at fair value |  |
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  |
Level 3 [Member] | Other [Member] |  |
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value | 100 | 100
Level 3 [Member] | U.S. Treasury obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value |  |
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  |
Level 3 [Member] | U.S. Agency obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value |  |
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  |
Level 3 [Member] | Sovereign obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value |  |
Level 3 [Member] | Corporate debt and other obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value |  |
Securities sold, but 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 | 52 | 40
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  |
Level 3 [Member] | Municipal obligations [Member] |  |
Securities owned |  |
Securities owned, at fair value | 10,303 | 9,394
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  |
Level 3 [Member] | Convertible bonds [Member] |  |
Securities owned |  |
Securities owned, at fair value |  |
Securities sold, but not yet purchased |  |
Securities sold, but not yet purchased at fair value |  |
Level 3 [Member] | Other [Member] |  |
Securities owned |  |
Securities owned, at fair value | 62,489 | 62,963
Level 3 [Member] | Other [Member] |  |
Securities owned |  |
Investments | $ 12,779 | $ 12,954

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