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Equity-Based Compensation - Activity with Respect to SARs (Detail) - SARs - $ / shares
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Number of Shares                
Number of Shares, Issued and unvested as of beginning of period (in shares) 306,575 307,514 479,656 479,656   307,514 479,656 479,656
Number of Shares, Activity for the three months ended March 31, 2016 (in shares) 0     0        
Number of Shares, Granted (in shares)     25,000          
Number of Shares, Exercised (in shares)   (939)            
Number of Shares, Issued and unvested as of end of period (in shares) 306,575 306,575 504,656 479,656   306,575 504,656 307,514
Weighted Average Base Price                
Weighted Average Base Price, Outstanding as of beginning of period (in dollars per share) $ 11.28 $ 11.28 $ 10.64 $ 10.64   $ 11.28 $ 10.64 $ 10.64
Weighted Average Base Price, Activity for the three months ended March 31, 2016 (in dollars per share) 0.00     0.00        
Weighted Average Base Price, Granted (in dollars per share)     9.04          
Weighted Average Base Price, Exercised (in dollars per share)   9.98            
Weighted Average Base Price, Outstanding as of end of period (in dollars per share) 11.28 11.28 10.56 10.64   11.28 10.56 11.28
Weighted Average Grant Date Fair Value Per Share                
Weighted Average Fair Value, Outstanding as of beginning of period (in dollars per share) 6.21 6.21 5.80 5.80   6.21 5.80 5.80
Weighted Average Fair Value, Activity for the three months ended March 31, 2016 (in dollars per share) 0.00     0.00        
Weighted Average Fair Value, Granted (in dollars per share)     4.80          
Weighted Average Fair Value, Exercised (in dollars per share)   5.33            
Weighted Average Fair Value, Outstanding as of end of period (in dollars per share) $ 6.21 $ 6.21 $ 5.75 $ 5.80   $ 6.21 $ 5.75 $ 6.21
Number of shares issued (in shares)   171 0 0 0 171 0  
First anniversary of grant date                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock awards vesting period           4 years    
Vesting percentage           25.00%    
Vested ratably each month over the subsequent 36 months                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock awards vesting period           36 months    
Vesting percentage           75.00%