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Business Acquisitions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 06, 2017
Oct. 14, 2016
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Dec. 31, 2016
Nov. 10, 2016
Business Acquisition [Line Items]                
Goodwill       $ 48,514   $ 48,514 $ 34,371  
TIW Corporation                
Business Acquisition [Line Items]                
Stock purchase agreement, par value of common stock (in dollars per share)   $ 100.0            
Cash purchase price as a result of business acquisition   $ 142,700            
Acquisition costs           $ 2,500    
Goodwill   $ 34,400           $ 34,371
Revenues     $ 133,526 36,300 $ 485,505      
Pre-tax operating loss     $ 14,637 (13,900) $ 89,290      
Net income (loss) from business acquisition       $ (8,700)        
Technology Alliance Inc.                
Business Acquisition [Line Items]                
Cash purchase price as a result of business acquisition $ 20,000