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Divestitures - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2016
Sep. 30, 2016
Jan. 31, 2016
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Distribution received from investees         $ 1,438  
Divestiture transaction consideration recorded as other receivable       $ 3   $ 34
East Gate            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Distribution received from investees   $ 1,438        
Investments fund expiration date       2017-08    
Divestiture transaction consideration recorded as other receivable         $ 1,100  
East Gate | Korean Investor            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Sale of ownership under agreement 17.65%          
Perfect Pairs            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Sale of ownership under agreement     100.00%      
Proceeds from disposal of subsidiary     $ 760