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Investments in Affiliates - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Asphalt Terminal Entity [Member] | Limited Liability Company [Member] | Nevada [Member]      
Investments In And Advances To Affiliates [Line Items]      
Equity interest acquired 50.00%    
Joint Venture Unconsolidated [Member]      
Investments In And Advances To Affiliates [Line Items]      
Total assets $ 307,289 $ 160,359 $ 163,714
Joint Venture Unconsolidated [Member] | Texas [Member]      
Investments In And Advances To Affiliates [Line Items]      
Equity Method Investments 17,500 24,300 23,600
Other Affiliates [Member] | Joint Venture Unconsolidated [Member]      
Investments In And Advances To Affiliates [Line Items]      
Total assets 307,300    
Equity Method Investments 84,840 $ 38,469 $ 39,946
Variable Interest Entity, Not Primary Beneficiary [Member] | Joint Venture Unconsolidated [Member]      
Investments In And Advances To Affiliates [Line Items]      
Total assets $ 26,000    
Minimum [Member] | Foreign Affiliates [Member] | Joint Venture Unconsolidated [Member] | Equity Method Investment Directly Owned [Member]      
Investments In And Advances To Affiliates [Line Items]      
Ownership percentage 25.00%    
Minimum [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Real Estate Entities [Member] | Joint Venture Unconsolidated [Member]      
Investments In And Advances To Affiliates [Line Items]      
Total assets $ 400    
Minimum [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Foreign Affiliates [Member] | Joint Venture Unconsolidated [Member]      
Investments In And Advances To Affiliates [Line Items]      
Total assets $ 100    
Maximum [Member] | Foreign Affiliates [Member] | Joint Venture Unconsolidated [Member] | Equity Method Investment Indirectly Owned [Member]      
Investments In And Advances To Affiliates [Line Items]      
Ownership percentage 50.00%    
Maximum [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Real Estate Entities [Member] | Joint Venture Unconsolidated [Member]      
Investments In And Advances To Affiliates [Line Items]      
Total assets $ 53,500    
Maximum [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Foreign Affiliates [Member] | Joint Venture Unconsolidated [Member]      
Investments In And Advances To Affiliates [Line Items]      
Total assets $ 63,000