Quarterly report pursuant to Section 13 or 15(d)

Equity-Based Compensation - Summary of Equity Grants (Detail)

v3.5.0.2
Equity-Based Compensation - Summary of Equity Grants (Detail) - $ / shares
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Performance Units        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Beginning Balance, Units 6,386 96,971    
Vested, Units   (90,585)    
Forfeited, Units (6,386)      
Ending Balance, Units   6,386    
Fair Value per unit   $ 3.75 $ 3.75 $ 3.75
Deferred Compensation Share Based Payments        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Beginning Balance, Units 4,911 52,188    
Vested, Units (4,911) (47,277)    
Ending Balance, Units   4,911    
Deferred Compensation Share Based Payments | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Fair Value per unit   $ 12.00 12.00 12.00
Vested, Range of Fair Value per unit   (12.00)    
Deferred Compensation Share Based Payments | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Fair Value per unit   10.81 $ 14.25 $ 15.65
Vested, Range of Fair Value per unit $ (10.92) $ (13.97)