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Equity-Based Compensation - Additional Information (Detail) - USD ($)
12 Months Ended
Jun. 11, 2014
Dec. 31, 2015
Dec. 31, 2014
Feb. 19, 2015
Nov. 30, 2014
Nov. 25, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total compensation expense   $ 18,814,000 $ 58,007,000      
Common Stock, shares issued   130,974,073 130,778,365      
Cash severance payment   $ 11,021,000        
Former President and Chief Executive Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Cash severance payment   $ 7,600,000        
Blackstone [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of common shares outstanding   28.30%     45.20%  
Performance Unit Grant II [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grant-date fair value   $ 25.35        
Promote Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expense accrued or recognized for Units granted   $ 0        
Issuance of vested and unvested restricted shares   3,100,000        
Initial public offering price   $ 17.00        
Total compensation expense   $ 5,600,000 $ 46,200,000      
Forfeited shares for stock based compensation   9,658        
Promote Plan [Member] | Restricted Stock [Member] | Tranche Two [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of common shares vested   40.00%        
Promote Plan [Member] | Restricted Stock [Member] | Blackstone [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of common shares outstanding           50.00%
Promote Plan [Member] | Restricted Stock [Member] | Blackstone [Member] | Tranche Three [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of common shares vested   20.00%        
Promote Plan [Member] | Common Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of common shares outstanding   50.00%        
Promote Plan [Member] | Common Stock [Member] | Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of common shares vested   40.00%        
2014 Omnibus Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Issuance of vested and unvested restricted shares   350,000        
Initial public offering price   $ 16.65        
Total compensation expense   $ 16,000,000 $ 11,700,000      
Forfeited shares for stock based compensation   52,926        
Grant-date fair value   $ 19.80        
Unrecognized compensation expense   $ 15,000,000        
Share reserved for purchase   11,800,000        
2014 Omnibus Incentive Plan [Member] | Former President and Chief Executive Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares vested   300,000        
Non-cash severance charge   $ 3,000,000        
2014 Omnibus Incentive Plan [Member] | Restricted Stock [Member] | Tranche Two [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of common shares vested   40.00%        
2014 Omnibus Incentive Plan [Member] | Restricted Stock [Member] | Blackstone [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of common shares outstanding           50.00%
2014 Omnibus Incentive Plan [Member] | Restricted Stock [Member] | Blackstone [Member] | Tranche Three [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of common shares vested   10.00%        
2014 Omnibus Incentive Plan [Member] | Omnibus Incentive Plan Grant II [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common Stock, shares issued 1,010,000          
Grant price $ 18.70          
Performance unit grant, remaining life   10 months 24 days        
2014 Omnibus Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Performance unit grant, remaining life   1 year 3 months 18 days        
Shares granted during the period   44,197 44,197      
Shares granted vesting description   The Director Unit Grants vests in three equal installments on the first, second and third anniversaries of the grant dates        
Grant-date fair value   $ 21.32        
2014 Omnibus Incentive Plan [Member] | Performance-based RSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common Stock, shares issued 500,000          
Performance unit grant, remaining life   1 year        
Restricted stock units issued 109          
Description of value of units granted under the plan   The calculation of the value of the units granted under the 2014 Performance Unit Grant is weighted as follows: 70% based on our total shareholder return (“TSR”) relative to the total shareholder returns of a defined set of peer companies (“Relative Shareholder Return”); and 30% based on our absolute TSR compound annual growth rate (“TSR CAGR”).        
2014 Omnibus Incentive Plan [Member] | Performance-based RSUs [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Payout range   33.00%        
2014 Omnibus Incentive Plan [Member] | Performance-based RSUs [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Payout range   167.00%        
2014 Omnibus Incentive Plan [Member] | 2015 Grant I [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common Stock, shares issued   200,000        
Performance unit grant, remaining life   1 year 4 months 24 days        
Grant date weighted average price of awards   $ 21.81        
2014 Omnibus Incentive Plan [Member] | Common Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of common shares outstanding   50.00%        
2014 Omnibus Incentive Plan [Member] | Common Stock [Member] | Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of common shares vested   50.00%        
Common stock vested, date   Apr. 14, 2015        
2014 Omnibus Incentive Plan Performance UG II [Member] | Performance-based RSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common Stock, shares issued       300,000    
Performance unit grant, remaining life   2 years        
Description of value of units granted under the plan   The calculation of the value of the units granted under the 2015 Performance Unit Grant is based solely on our TSR relative to the Relative Shareholder Return.        
2014 Omnibus Incentive Plan Performance UG II [Member] | Performance-based RSUs [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Payout range   33.00%        
2014 Omnibus Incentive Plan Performance UG II [Member] | Performance-based RSUs [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Payout range   200.00%