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Related Party Transactions - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2016
Dec. 31, 2017
Dec. 31, 2017
Oct. 10, 2017
Sep. 26, 2017
Apr. 29, 2016
Wealth Warrior Global Limited | The Grande Holdings Limited (“Grande”)            
Related Party Transaction [Line Items]            
Percentage of outstanding shares acquired         65.90%  
Wealth Warrior Global Limited and its Affiliates | The Grande Holdings Limited (“Grande”)            
Related Party Transaction [Line Items]            
Related party ownership percentage       73.90%    
The Grande Holdings Limited (“Grande”)            
Related Party Transaction [Line Items]            
Grande's Ownership Interest in Emerson number of shares   15,243,283 15,243,283      
Grande's Ownership Interest Percentage   63.80% 63.80%      
S&T            
Related Party Transaction [Line Items]            
Repayment of pledged collateral amount $ 500,000          
Release of collateral, net of expenses incurred           $ 421,000
S&T | IRS            
Related Party Transaction [Line Items]            
Expenses incurred in defending IRS challenge $ 79,000          
GPML and LSSL            
Related Party Transaction [Line Items]            
Utility and service charges   $ 4,000 $ 13,000      
GPML            
Related Party Transaction [Line Items]            
Due to related parties for utility and service charges   0 0      
LSSL            
Related Party Transaction [Line Items]            
Due to related parties for utility and service charges   0 0      
PAL, SARC and TICL            
Related Party Transaction [Line Items]            
Administrative service fees charged to related parties   6,000 17,000      
PAL            
Related Party Transaction [Line Items]            
Due from related parties for administrative service fees   0 0      
SARC            
Related Party Transaction [Line Items]            
Due from related parties for administrative service fees   0 0      
TICL            
Related Party Transaction [Line Items]            
Due from related parties for administrative service fees   $ 0 $ 0