Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Equity-Based Compensation - Summary of RSU Grants (Detail) - Restricted Stock Units - $ / shares
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Beginning Balance, Units 739,256 966,510
Granted, Units   14,373
Vested, Units (5,843)  
Ending Balance, Units 733,413 980,883
Fair Value per unit   $ 13.23
Fair Value per unit, Vested $ 3.19  
Fair Value per unit, Granted   13.19
Minimum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Fair Value per unit 13.19  
Fair Value per unit 13.19 13.19
Maximum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Fair Value per unit 13.23  
Fair Value per unit $ 13.23 $ 13.23