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Related Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Oct. 10, 2017
Sep. 26, 2017
Related Party Transaction [Line Items]        
Utility and service charges $ 2,211,000 $ 2,771,000    
Nimble Holding Company Limited        
Related Party Transaction [Line Items]        
Nimble's Ownership Interest in Emerson number of shares 15,243,283      
Nimble's Ownership Interest Percentage 67.60%      
Nimble Holding Company Limited | Wealth Warrior Global Limited        
Related Party Transaction [Line Items]        
Percentage of outstanding shares acquired       65.90%
Nimble Holding Company Limited | Wealth Warrior Global Limited and its Affiliates        
Related Party Transaction [Line Items]        
Related party ownership percentage     73.90%  
LSSL        
Related Party Transaction [Line Items]        
Due to related parties for utility and service charges $ 0      
LSSL | Utility and Service        
Related Party Transaction [Line Items]        
Utility and service charges 1,000      
PAL, SARC and TICL        
Related Party Transaction [Line Items]        
Administrative service fees charged to related parties 6,000      
PAL        
Related Party Transaction [Line Items]        
Due from related parties for administrative service fees 0      
SARC        
Related Party Transaction [Line Items]        
Due from related parties for administrative service fees 0      
TICL        
Related Party Transaction [Line Items]        
Due from related parties for administrative service fees $ 0