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Equity-Based Compensation - Additional Information (Detail) - USD ($)
12 Months Ended
Feb. 19, 2015
Jun. 11, 2014
Apr. 14, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nov. 30, 2014
Nov. 25, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Total compensation expense       $ 13,338,000 $ 14,153,000 $ 18,814,000    
Common Stock, shares issued       132,478,073 131,750,715      
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       30.00%     45.20%  
Performance-based Restricted Stock Units (PSUs) [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Description of value of units granted under the plan       The calculation of the value of the units granted during the year ended December 31, 2017 was based solely on our total TSR relative to the Relative Shareholder Return        
Weighted average grant date fair value       $ 15.79 $ 12.18      
Shares granted during the period       400,000 400,000      
Performance awards performance period       3 years 3 years      
Performance-based Restricted Stock Units (PSUs) [Member] | Minimum [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Payout range       33.00% 33.00%      
Performance-based Restricted Stock Units (PSUs) [Member] | Maximum [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Payout range       200.00% 200.00%      
Performance Unit Grant II [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Weighted average 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    
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       $ 15,800,000 $ 14,100,000 $ 16,000,000    
Weighted average grant date fair value   $ 19.80            
Shares granted during the period       800,000        
Unrecognized compensation expense       $ 15,600,000        
Weighted average period of recognition for unrecognized compensation expense       1 year 3 months 18 days        
Unvested shares       1,200,000 1,000,000      
Vest shares       500,000        
Share reserved for purchase       10,700,000        
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            
2014 Omnibus Incentive Plan [Member] | Performance-based Restricted Stock Units (PSUs) [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Common Stock, shares issued   500,000            
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”).        
Percentage of Relative Shareholder Return to calculate value of unit granted       70.00%        
Percentage of TSR compound annual growth rate to calculate value of unit granted       30.00%        
2014 Omnibus Incentive Plan [Member] | Performance-based Restricted Stock Units (PSUs) [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 Restricted Stock Units (PSUs) [Member] | Maximum [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Payout range   167.00%            
2014 Omnibus Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Weighted average grant date fair value       $ 14.95 $ 14.95 $ 14.95    
Shares granted during the period       132,866 132,866 132,866    
Shares granted vesting description       The Director Unit Grants vests in three equal installments on the first, second and third anniversaries of the grant dates        
Shares granted vesting period in installments       3 years        
Performance unit grant, remaining life       1 year 2 months 12 days        
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       2 months 12 days        
Grant date weighted average price of awards           $ 21.81    
2014 Omnibus Incentive Plan [Member] | 2016 Grant I [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Common Stock, shares issued         400,000      
Performance unit grant, remaining life       1 year        
Grant date weighted average price of awards         $ 11.87      
2014 Omnibus Incentive Plan [Member] | 2016 Grant II [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Common Stock, shares issued         300,000      
Performance unit grant, remaining life       1 year 3 months 18 days        
Grant date weighted average price of awards         $ 11.35      
Performance awards performance period         3 years      
2014 Omnibus Incentive Plan [Member] | 2017 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       3 months 18 days        
Grant date weighted average price of awards       $ 13.98        
2014 Omnibus Incentive Plan [Member] | 2017 Grant II [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 6 months        
Grant date weighted average price of awards       $ 13.61        
Performance awards performance period       3 years        
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 Restricted Stock Units (PSUs) [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Common Stock, shares issued 300,000              
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 Restricted Stock Units (PSUs) [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 Restricted Stock Units (PSUs) [Member] | Maximum [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Payout range 200.00%