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Employee Compensation and Benefit Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Employer percent match of employee contributions 50.00%    
Employer match limit, percent of employee compensation 2.00%    
Contributions to 401(k) $ 4.7 $ 3.8 $ 4.2
Compensation expense recognized $ 30.2 $ 13.5 $ 28.4
Common stock remaining available for future issuance (in shares) 7,702,134    
Contractual term of all options granted 10 years    
Restricted stock units granted 790,397    
Average common stock trading price $ 16.26    
Unrecognized compensation costs related to non-vested stock options $ 4.9    
Weighted average remaining requisite service period 1 year 11 months    
Market Condition For Vesting [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Restricted stock units granted 584,438