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Acquisitions - Estimated Fair Values of Identifiable Intangible Assets and Related Weighted Average Amortization (Details) - 2019 Acquisitions
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Estimated fair value at acquisition date $ 192,786
Weighted average amortization period at acquisition date 8 years
Customer relationships  
Finite-Lived Intangible Assets [Line Items]  
Estimated fair value at acquisition date $ 167,262
Weighted average amortization period at acquisition date 7 years 10 months 24 days
Backlog  
Finite-Lived Intangible Assets [Line Items]  
Estimated fair value at acquisition date $ 8,278
Weighted average amortization period at acquisition date 1 year
Trade names  
Finite-Lived Intangible Assets [Line Items]  
Estimated fair value at acquisition date $ 11,752
Weighted average amortization period at acquisition date 15 years
Non-compete agreements  
Finite-Lived Intangible Assets [Line Items]  
Estimated fair value at acquisition date $ 3,712
Weighted average amortization period at acquisition date 4 years 3 months 18 days
Curriculum  
Finite-Lived Intangible Assets [Line Items]  
Estimated fair value at acquisition date $ 1,782
Weighted average amortization period at acquisition date 10 years