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Equity-Based Compensation - Restricted Stock Transactions (Details) - $ / shares
12 Months Ended
Feb. 09, 2018
Feb. 03, 2016
Dec. 21, 2015
May 26, 2015
May 20, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                
Outstanding shares, Balance December 31, 2014 (in shares)           1,581,711 2,908,374 3,900,000
Granted (in shares) 772,642   318,000     1,146,586 982,764 844,646
Canceled (in shares)           (22,515) (127,801) (57,484)
Vested (in shares)           (628,517) (2,181,626) (1,793,132)
Outstanding shares, Balance December 31, 2015 (in shares)           2,077,265 1,581,711 2,908,374
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]                
Grants in period, weighted average grant date fair value (in dollars per share)   $ 45.85 $ 32.37     $ 46.27 $ 38.31 $ 28.56
Vested in period, weighted average grant date fair value (in dollars per share)           34.90    
Forfeitures, weighted average grant date fair value (in dollars per share)           42.71 34.23  
Outstanding (in usd per share)           $ 40.77 34.48  
The Omnibus Plan | Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                
Outstanding shares, Balance December 31, 2015 (in shares)           3,596,344    
The Omnibus Plan | Restricted Stock | Common Class A                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                
Converted (in shares)       7,994,215        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]                
Converted in period, weighted average grant date fair value (in dollars per share)         $ 24.50      
BKLS LLC Profit Interests Plan                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                
Converted (in shares)       (10,733,330)        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]                
Grants in period, weighted average grant date fair value (in dollars per share)               $ 2.10
Vested in period, weighted average grant date fair value (in dollars per share)             $ 2.01  
Maximum | BKLS LLC Profit Interests Plan                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]                
Forfeitures, weighted average grant date fair value (in dollars per share)           $ 3.77    
Minimum | BKLS LLC Profit Interests Plan                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]                
Forfeitures, weighted average grant date fair value (in dollars per share)           $ 2.01