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Equity-Based Compensation - Restricted Stock Awards with Market Conditions Additional Information (Detail)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2014
trading_day
$ / shares
shares
Jun. 30, 2017
USD ($)
shares
Mar. 31, 2017
shares
Jun. 30, 2016
USD ($)
shares
Mar. 31, 2016
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2011
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of shares, forfeited (in shares)       15,000        
Restricted stock                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of shares granted (in shares)   54,310 286,256 112,397 434,283      
Number of shares, forfeited (in shares)     167,712 7,500 588,819      
Restricted stock | 2014 Management Market-Based Awards                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of shares granted (in shares) 1,277,500             366,666
Share-based payment award, threshold, number of trading days | trading_day 45              
Vesting percentage 25.00%              
Number of shares, forfeited (in shares)   20,000            
Restricted stock | 2014 Management Market-Based Awards | Tranche one                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Volume weighted average price targets (in dollars per share) | $ / shares $ 28.07              
Restricted stock | 2014 Management Market-Based Awards | Tranche two                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Volume weighted average price targets (in dollars per share) | $ / shares 30.16              
Restricted stock | 2014 Management Market-Based Awards | Tranche three                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Volume weighted average price targets (in dollars per share) | $ / shares 32.38              
Restricted stock | 2014 Management Market-Based Awards | Tranche four                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Volume weighted average price targets (in dollars per share) | $ / shares $ 34.71              
Restricted stock | 2014 Employee Market-Based Awards                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of shares granted (in shares)   90,800            
Share-based payment award, threshold, number of trading days | trading_day 45              
Number of shares, forfeited (in shares)   12,600            
Restricted stock | 2014 Management and Employee Market Based Awards                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Share based compensation expense | $   $ 0.1   $ 0.1   $ 0.1 $ 0.8