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Related Party Transactions - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
Apr. 30, 2016
Jun. 30, 2017
Apr. 29, 2016
The Grande Holdings Limited (“Grande”)      
Related Party Transaction [Line Items]      
Grande's Ownership Interest in Emerson number of shares   15,243,283  
Grande's Ownership Interest Percentage   56.40%  
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  
GPML      
Related Party Transaction [Line Items]      
Due to related parties for utility and service charges   0  
LSSL      
Related Party Transaction [Line Items]      
Due to related parties for utility and service charges   0  
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