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Long-term Obligations - DBM Global Credit Facilities (Details) - USD ($)
12 Months Ended
Oct. 21, 2014
May 06, 2014
Dec. 31, 2016
Dec. 31, 2015
Jan. 23, 2015
Jan. 22, 2015
Line of Credit Facility [Line Items]            
Outstanding debt     $ 388,702,000      
DBM Global | Note Payable Collateralized by Real Estate            
Line of Credit Facility [Line Items]            
Outstanding debt     $ 3,400,000 $ 4,000,000    
DBM Global | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Line of credit, maximum amount           $ 50,000,000
Basis spread on variable rate (as a percent)     3.00%      
Credit agreement interest rate (as a percent)     3.63%      
DBM Global | Revolving Credit Facility | Note Payable Collateralized by Equipment            
Line of Credit Facility [Line Items]            
Proceeds from note payable collateralized (up to) $ 10,000,000          
DBM Global | Letter of Credit            
Line of Credit Facility [Line Items]            
Line of credit, maximum amount     $ 0 0 $ 14,500,000.0 $ 5,000,000.0
Line of credit outstanding amount     $ 0 0    
Real Estate Term Advance | DBM Global            
Line of Credit Facility [Line Items]            
Debt instrument term     5 years      
Real Estate Term Advance | DBM Global | Note Payable Collateralized by Real Estate            
Line of Credit Facility [Line Items]            
Basis spread on variable rate (as a percent) 4.00%          
Real Estate Term Advance | DBM Global | Note Payable Collateralized by Equipment            
Line of Credit Facility [Line Items]            
Basis spread on variable rate (as a percent)   4.00%        
Outstanding debt     $ 6,100,000 8,100,000    
Real Estate Term Advance | DBM Global | Note Payable Collateralized by Assets            
Line of Credit Facility [Line Items]            
Outstanding debt     $ 0 $ 2,200,000    
Real Estate Term Advance | DBM Global | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Debt instrument term 5 years          
Real Estate Term Advance | DBM Global | Revolving Credit Facility | Note Payable Collateralized by Real Estate            
Line of Credit Facility [Line Items]            
Proceeds from note payable collateralized (up to) $ 5,000,000 $ 5,000,000