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Debt Obligations - Other (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 20, 2019
USD ($)
Dec. 19, 2019
USD ($)
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Obligations            
Payments on term loan       $ 15,000    
Financing and professional cost         $ 1,405 $ 844
Outstanding balance $ 226,483     236,000 226,483  
Reconciliation of Credit Facility Adjusted EBITDA to net income            
Net income       150,139 114,324 112,903
Provision for income taxes       41,401 37,418 35,773
Stock-based compensation       $ 6,934 5,878 $ 7,161
Principal financial covenants            
Fixed charge coverage ratio       2.00    
Other disclosures            
2022       $ 23,000    
2023       34,000    
Revolving credit facility            
Debt Obligations            
Borrowing capacity   $ 450,000        
Payments of financing costs line of credit arrangements 1,000          
Outstanding borrowings       70,000    
Outstanding balance 28,000     70,000 28,000  
Letters of credit amount outstanding       49,500    
Credit available       330,500    
Book value of assets pledged as collateral       $ 167,800    
Number of quarters of net earnings used for the calculation of the credit facility adjusted EBITDA | item       4    
Reconciliation of Credit Facility Adjusted EBITDA to net income            
Net income       $ 150,139    
Provision for income taxes       41,401    
Interest expense, net       8,282    
Depreciation and amortization expense       (60,629)    
Stock-based compensation       6,934    
Pre-acquisition results of acquired companies, as defined under the Facility       (18,511)    
Credit Facility Adjusted EBITDA       $ 285,896    
Principal financial covenants            
Number of interest rate options | item       2    
Leverage ratio       0.8    
Fixed charge coverage ratio       7.2    
Number of quarters of capital expenditures, tax provision, dividends and stock repurchase payments used for calculation of fixed charge coverage ratio | item       4    
Period of Credit Facility Adjusted EBITDA for determining additional margins       12 months    
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Weighted average interest rate (as a percent)       1.40%    
Revolving credit facility | Through maturity            
Principal financial covenants            
Leverage ratio       3.00    
Revolving credit facility | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 1.00            
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Letter of credit fees (as a percent)       1.25%    
Commitment fees payable on unused portion of the facility (as a percent)       0.20%    
Revolving credit facility | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.00 to 1.75            
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Letter of credit fees (as a percent)       1.50%    
Commitment fees payable on unused portion of the facility (as a percent)       0.25%    
Revolving credit facility | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.75 to 2.50            
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Letter of credit fees (as a percent)       1.75%    
Commitment fees payable on unused portion of the facility (as a percent)       0.30%    
Revolving credit facility | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.50 or greater            
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Letter of credit fees (as a percent)       2.00%    
Commitment fees payable on unused portion of the facility (as a percent)       0.35%    
Revolving credit facility | Minimum            
Principal financial covenants            
Fixed charge coverage ratio       1.50    
Revolving credit facility | Minimum | Covenant Requirement            
Principal financial covenants            
Net leverage ratio used as basis for other restrictions       2.50    
Revolving credit facility | Maximum            
Principal financial covenants            
Permitted amount of acquisitions per transaction       $ 5,000    
Aggregate purchase price of current acquisition and acquisitions in the preceding 12 month period for determining permitted amount of acquisition per transaction       $ 10,000    
Revolving credit facility | Base Rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 1.00            
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Additional per annum interest margin (as a percent)       0.25%    
Revolving credit facility | Base Rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.00 to 1.75            
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Additional per annum interest margin (as a percent)       0.50%    
Revolving credit facility | Base Rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.75 to 2.50            
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Additional per annum interest margin (as a percent)       0.75%    
Revolving credit facility | Base Rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.50 or greater            
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Additional per annum interest margin (as a percent)       1.00%    
Revolving credit facility | Eurodollar Rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 1.00            
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Additional per annum interest margin (as a percent)       1.25%    
Revolving credit facility | Eurodollar Rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.00 to 1.75            
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Additional per annum interest margin (as a percent)       1.50%    
Revolving credit facility | Eurodollar Rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.75 to 2.50            
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Additional per annum interest margin (as a percent)       1.75%    
Revolving credit facility | Eurodollar Rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.50 or greater            
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Additional per annum interest margin (as a percent)       2.00%    
Amended senior revolving credit facility            
Debt Obligations            
Borrowing capacity   600,000 $ 400,000 $ 585,000    
Line of credit borrowing capacity accordion option   150,000        
Payments on term loan       15,000    
Financing and professional cost 1,400          
Unamortized costs     $ 1,300      
Term loan            
Debt Obligations            
Borrowing capacity   $ 150,000        
Repayment in terms of percentage of original aggregate principal amount   3.75% 1.25%      
Payments of financing costs term loan 400          
Outstanding balance 150,000     $ 135,000 150,000  
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Weighted average interest rate (as a percent)       1.40%    
Notes to former owners            
Other disclosures            
Cumulative number of companies acquired | item       4    
Outstanding balance $ 48,483     $ 31,000 $ 48,483  
Promissory note | Walker            
Other disclosures            
Outstanding balance       $ 10,000    
Stated interest rate (as a percent)       4.00%    
Promissory note | TAS Energy            
Other disclosures            
Outstanding balance       $ 8,000    
Stated interest rate (as a percent)       3.50%    
Promissory note | T E C Industrial Construction and Maintenance            
Other disclosures            
Outstanding balance       $ 7,000    
Stated interest rate (as a percent)       2.50%    
Promissory note | Electrical Contractor North Carolina            
Other disclosures            
Outstanding balance       $ 6,000    
Stated interest rate (as a percent)       3.00%    
Letter of Credit            
Debt Obligations            
Borrowing capacity   $ 160,000        
Federal Funds Rate | Revolving credit facility | Base Rate            
Market rates relating to interest options            
Market rate (as a percent)       0.59%    
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Additional per annum interest margin (as a percent)       0.50%    
Wells Fargo Bank, N.A. Prime Rate | Revolving credit facility | Base Rate            
Market rates relating to interest options            
Market rate (as a percent)       3.25%    
One-month LIBOR | Revolving credit facility | Base Rate            
Market rates relating to interest options            
Market rate (as a percent)       1.14%    
Debt Instrument, Interest Rate, Effective Percentage [Abstract]            
Additional per annum interest margin (as a percent)       1.00%    
One-month LIBOR | Revolving credit facility | Eurodollar Rate            
Market rates relating to interest options            
Variable rate basis       One-month LIBOR    
Market rate (as a percent)       0.14%    
Six-month LIBOR | Revolving credit facility | Eurodollar Rate            
Market rates relating to interest options            
Variable rate basis       Six-month LIBOR    
Market rate (as a percent)       0.26%