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Fair Value Measurements - Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warehouse receivables $ 847,712 $ 1,767,107
Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 57,968 56,562
Trading securities 68,471 64,124
Warehouse receivables 847,712 1,767,107
Loan commitments   1,680
Foreign currency exchange forward contracts 12,586 9,236
Total assets at fair value 986,737 1,898,709
Interest rate swaps 22,840 21,502
Securities sold, not yet purchased 3,084 4,436
Foreign currency exchange forward contracts 5,429 1,008
Total liabilities at fair value 31,353 26,946
Recurring [Member] | U.S. treasury securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 6,752 7,350
Recurring [Member] | Debt securities issued by U.S. federal agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 5,104 3,360
Recurring [Member] | Corporate debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 18,957 18,085
Recurring [Member] | Asset-backed securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 2,890 1,897
Recurring [Member] | Collateralized mortgage obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 1,297 1,752
Recurring [Member] | Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 35,000 32,444
Recurring [Member] | Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 22,968 24,118
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 29,720 31,468
Trading securities 68,471 64,124
Total assets at fair value 98,191 95,592
Securities sold, not yet purchased 3,084 4,436
Total liabilities at fair value 3,084 4,436
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | U.S. treasury securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 6,752 7,350
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 6,752 7,350
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 22,968 24,118
Recurring [Member] | Significant Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 28,248 25,094
Warehouse receivables 847,712 1,767,107
Foreign currency exchange forward contracts 12,586 9,236
Total assets at fair value 888,546 1,801,437
Interest rate swaps 22,840 21,502
Foreign currency exchange forward contracts 5,429 1,008
Total liabilities at fair value 28,269 22,510
Recurring [Member] | Significant Observable Inputs (Level 2) [Member] | Debt securities issued by U.S. federal agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 5,104 3,360
Recurring [Member] | Significant Observable Inputs (Level 2) [Member] | Corporate debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 18,957 18,085
Recurring [Member] | Significant Observable Inputs (Level 2) [Member] | Asset-backed securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 2,890 1,897
Recurring [Member] | Significant Observable Inputs (Level 2) [Member] | Collateralized mortgage obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 1,297 1,752
Recurring [Member] | Significant Observable Inputs (Level 2) [Member] | Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities $ 28,248 25,094
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loan commitments   1,680
Total assets at fair value   $ 1,680