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Stock-based Compensation - Additional Information (Detail)
$ in Thousands
3 Months Ended
Jun. 01, 2014
Mar. 31, 2016
USD ($)
shares
Mar. 31, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense associated with grants | $   $ 431 $ 366
Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense associated with grants | $   400  
Unamortized stock-based compensation expense related to unvested awards | $   $ 3,200  
Weighted-average remaining vesting period   3 years  
Ensign Employees [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock award conversion ratio related to the spin-off 1    
Ensign Employees [Member] | Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock awards unvested during spin-off (in shares) | shares   207,580  
Shares vested | shares   16,800  
Unvested stock awards outstanding (in shares) | shares   72,030