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Goodwill and Identified Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 284,966 $ 249,726
Accumulated Amortization (79,468) (75,608)
Net Carrying Amount $ 205,498 174,118
License Agreements    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Lives (Years) 4 years 1 month 10 days  
Gross Carrying Amount $ 3,898 3,893
Accumulated Amortization (3,320) (3,275)
Net Carrying Amount $ 578 618
Leases    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Lives (Years) 11 years 3 months  
Gross Carrying Amount $ 2,065 2,065
Accumulated Amortization (801) (764)
Net Carrying Amount $ 1,264 1,301
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Lives (Years) 15 years 8 days  
Gross Carrying Amount $ 24,079 22,519
Accumulated Amortization (6,649) (6,262)
Net Carrying Amount $ 17,430 16,257
Non-competes    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Lives (Years) 2 years 2 months 9 days  
Gross Carrying Amount $ 1,210 1,210
Accumulated Amortization (972) (945)
Net Carrying Amount $ 238 265
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Lives (Years) 12 years 5 months 25 days  
Gross Carrying Amount $ 185,222 164,779
Accumulated Amortization (44,779) (41,967)
Net Carrying Amount $ 140,443 122,812
Patents and acquired technology    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Lives (Years) 13 years 8 months 10 days  
Gross Carrying Amount $ 68,492 55,260
Accumulated Amortization (22,947) (22,395)
Net Carrying Amount 45,545 $ 32,865
Underground Solutions | Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Finite intangible assets acquired 20,200  
Underground Solutions | Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Finite intangible assets acquired 1,500  
Underground Solutions | Patents and acquired technology    
Finite-Lived Intangible Assets [Line Items]    
Finite intangible assets acquired $ 12,800