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Fair Value Measurements - Financial Instruments Not Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financial Assets:        
Cash and cash equivalents $ 1,158,785 $ 1,132,083 $ 1,066,580 $ 841,482
Deposits with banks and short-term investments 419,668 389,861    
Cash deposited with clearing organizations and other segregated cash 29,030 34,948    
Interest-bearing financing receivables 76,133 81,774    
Financial Liabilities:        
Deposits and other customer payables 472,283 506,665    
Senior debt 1,188,600 989,358    
Carrying Value [Member]        
Financial Assets:        
Cash and cash equivalents 1,158,785 1,132,083    
Deposits with banks and short-term investments 419,668 389,861    
Cash deposited with clearing organizations and other segregated cash 29,030 34,948    
Interest-bearing financing receivables 76,133 81,774    
Interest-bearing deposits (included within investments) 456 54,885    
Financial Liabilities:        
Deposits and other customer payables 472,283 506,665    
Senior debt 1,188,600 989,358    
Fair Value [Member]        
Financial Assets:        
Deposits with banks and short-term investments 419,668 389,861    
Cash deposited with clearing organizations and other segregated cash 29,030 34,948    
Interest-bearing financing receivables 78,072 82,573    
Cash and cash equivalents 1,158,785 1,132,083    
Interest-bearing deposits (included within investments) 456 54,885    
Financial Liabilities:        
Deposits and other customer payables 472,283 506,665    
Senior debt 1,204,171 993,999    
Fair Value [Member] | Level 1 [Member]        
Financial Assets:        
Deposits with banks and short-term investments 419,668 389,861    
Cash deposited with clearing organizations and other segregated cash 29,030 34,948    
Cash and cash equivalents 1,158,785 1,132,083    
Interest-bearing deposits (included within investments) 456 54,885    
Financial Liabilities:        
Deposits and other customer payables 472,283 506,665    
Fair Value [Member] | Level 2 [Member]        
Financial Liabilities:        
Senior debt 1,204,171 993,999    
Fair Value [Member] | Level 3 [Member]        
Financial Assets:        
Interest-bearing financing receivables $ 78,072 $ 82,573