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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Deferred tax assets: |  |
Employee deferred compensation plans | $ 22,819 | $ 17,280
Reserve for litigation and legal fees | 17,019 | 5,469
Book versus tax depreciation differences | 5,931 | 3,675
Involuntary conversion | 1,686 | 1,534
Allowance for doubtful accounts | 941 | 1,044
Other | 18,973 | 16,317
Total deferred tax assets | 67,369 | 45,319
Deferred tax liabilities: |  |
Goodwill amortization (Section 197) | 39,391 | 34,915
Change in accounting method |  | 8,075
Partnership investments | 6,273 | 7,020
Capital markets acquisition (2008) |  | 4,801
Mortgage Servicing Rights | 6,679 | 3,387
Other | 2,559 | 1,247
Total deferred tax liabilities | 54,902 | 59,445
Deferred tax asset/(liabilities), net | 16,340 | (10,302)
U.S. [Member] |  |
Deferred tax liabilities: |  |
Deferred tax asset/(liabilities), net | 12,467 | (14,126)
Non U.S. [Member] |  |
Deferred tax liabilities: |  |
Deferred tax asset/(liabilities), net | $ 3,873 | $ 3,824

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