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Equity-Based Compensation - Activity with Respect to SARs (Detail) - SARs - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Number of Shares, Issued and unvested as of beginning of period (in shares) 307,514 479,656 479,656
Number of Shares, Activity for the three months ended March 31, 2016 (in shares)   0  
Number of Shares, Exercised (in shares) (939)    
Number of Shares, Issued and unvested as of end of period (in shares) 306,575 479,656 307,514
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Base Price [Roll Forward]      
Weighted Average Base Price, Outstanding as of beginning of period (in dollars per share) $ 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  
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 10.64 11.28
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted Average Fair Value, Outstanding as of beginning of period (in dollars per share) 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  
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 $ 5.80 $ 6.21
Number of shares issued (in shares) 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%