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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
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