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Equity-Method Investments - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 15, 2010
shares
Dec. 31, 2018
USD ($)
warehouse
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2010
USD ($)
shares
Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]              
Impairment of investments in joint venture   $ 0 $ 6,496 $ 0      
Equity method investment   $ 14,541 15,942        
China JV              
Schedule of Equity Method Investments [Line Items]              
Cash investments in joint venture         $ 1,300 $ 46,200  
Equity interest           49.00% 49.00%
Equity interest by CMHI           51.00%  
Number of warehouses operated by joint venture | warehouse   12          
Impairment of investments in joint venture     6,500        
Equity method investment     13,942        
Joint Venture              
Schedule of Equity Method Investments [Line Items]              
Equity method investment   $ 2,000 $ 2,000        
Series B Preferred Shares              
Schedule of Equity Method Investments [Line Items]              
Number of shares sold (in shares) | shares 375,000            
Series B Preferred Shares | CMHI              
Schedule of Equity Method Investments [Line Items]              
Number of shares sold (in shares) | shares 50,000         50,000