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Business Combinations - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 167,738   $ 155,466
Less seller obligations 5,420 $ 3,759  
CDG Acquisition [Member]      
Business Acquisition [Line Items]      
Accounts receivable 1,731    
Inventories 514    
Other current assets 28    
Property and equipment 933    
Intangibles 3,711    
Goodwill 4,898    
Other non-current assets 36    
Accounts payable and other current liabilities (438)    
Fair value of assets acquired and purchase price 11,413    
Less seller obligations 1,973    
Cash paid 9,440    
Other Acquisition [Member]      
Business Acquisition [Line Items]      
Accounts receivable 3,306 2,070  
Inventories 1,027 1,014  
Other current assets 892 8  
Property and equipment 1,893 1,144  
Intangibles 16,681 5,939  
Goodwill 6,873 2,472  
Other non-current assets 19 176  
Accounts payable and other current liabilities (2,002) (1,969)  
Fair value of assets acquired and purchase price 28,689 10,854  
Less seller obligations 3,447 1,042  
Cash paid 25,242 9,812  
Combined Business Acquisitions [Member]      
Business Acquisition [Line Items]      
Cash   247  
Accounts receivable 5,037 33,834  
Inventories 1,541 3,866  
Other current assets 920 4,552  
Property and equipment 2,826 3,971  
Intangibles 20,392 73,067  
Goodwill 11,771 46,124  
Other non-current assets 55 595  
Accounts payable and other current liabilities (2,440) (20,112)  
Fair value of assets acquired and purchase price 40,102 146,144  
Less fair value of common stock issued   10,859  
Less seller obligations 5,420 3,751  
Cash paid $ 34,682 131,534  
Alpha [Member]      
Business Acquisition [Line Items]      
Cash   247  
Accounts receivable   29,851  
Inventories   1,852  
Other current assets   4,500  
Property and equipment   1,528  
Intangibles   57,200  
Goodwill   38,511  
Other non-current assets   383  
Accounts payable and other current liabilities   (17,401)  
Fair value of assets acquired and purchase price   116,671  
Less fair value of common stock issued   10,859  
Less seller obligations   2,002  
Cash paid   103,810  
Columbia [Member]      
Business Acquisition [Line Items]      
Accounts receivable   989  
Inventories   704  
Other current assets   8  
Property and equipment   659  
Intangibles   4,760  
Goodwill   2,209  
Other non-current assets   36  
Accounts payable and other current liabilities   (372)  
Fair value of assets acquired and purchase price   8,993  
Less seller obligations   225  
Cash paid   8,768  
Astro [Member]      
Business Acquisition [Line Items]      
Accounts receivable   924  
Inventories   296  
Other current assets   36  
Property and equipment   640  
Intangibles   5,168  
Goodwill   2,932  
Accounts payable and other current liabilities   (370)  
Fair value of assets acquired and purchase price   9,626  
Less seller obligations   482  
Cash paid   $ 9,144