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Debt Obligations - Other (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2019
USD ($)
Dec. 20, 2019
Dec. 19, 2019
USD ($)
Sep. 30, 2020
USD ($)
item
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
item
Sep. 30, 2019
USD ($)
Debt Obligations                      
Outstanding balance $ 226,483     $ 222,570           $ 222,570  
Reconciliation of Credit Facility Adjusted EBITDA to net income                      
Net income       50,088 $ 39,495 $ 17,716 $ 36,233 $ 24,173 $ 19,866 107,299 $ 80,272
Income tax expense (benefit)       $ 8,279     $ 12,473     30,100 26,339
Stock-based compensation                   $ 5,949 $ 4,861
Principal financial covenants                      
Fixed charge coverage ratio       2.00           2.00  
Revolving credit facility                      
Debt Obligations                      
Borrowing capacity 450,000                    
Payments of financing costs line of credit arrangements 1,000                    
Outstanding borrowings       $ 61,500           $ 61,500  
Outstanding balance 28,000     61,500           61,500  
Letters of credit amount outstanding       55,600           55,600  
Credit available       $ 332,900           $ 332,900  
Principal financial covenants                      
Number of interest rate options | item                   2  
Leverage ratio       0.8           0.8  
Fixed charge coverage ratio       6.6           6.6  
Number of quarters of capital expenditures, tax provision, dividends and stock repurchase payments used for calculation of fixed charge coverage ratio | item                   4  
Other disclosures                      
Weighted average interest rate (as a percent)       1.40%           1.40%  
Revolving credit facility | Through maturity                      
Principal financial covenants                      
Leverage ratio       3.00           3.00  
Revolving credit facility | Minimum                      
Principal financial covenants                      
Fixed charge coverage ratio       1.50           1.50  
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 | Minimum | Covenant Requirement                      
Principal financial covenants                      
Net leverage ratio used as basis for other restrictions       2.50           2.50  
Revolving credit facility | Maximum                      
Principal financial covenants                      
Permitted amount of acquisitions per transaction       $ 5,000           $ 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           $ 10,000  
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 | 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                
Repayment in terms of percentage of original aggregate principal amount   3.75% 1.25%                
Line of credit borrowing capacity accordion option 150,000                    
Financing and professional cost 1,400                    
Unamortized costs     $ 1,300                
Term loan                      
Debt Obligations                      
Borrowing capacity 150,000                    
Payments of financing costs term loan 400                    
Outstanding balance 150,000     $ 135,000           $ 135,000  
Other disclosures                      
Weighted average interest rate (as a percent)       1.40%           1.40%  
Notes to former owners                      
Other disclosures                      
Cumulative number of companies acquired | item       4           4  
Outstanding balance 48,483     $ 26,050           $ 26,050  
Promissory note | Walker                      
Other disclosures                      
Outstanding balance       $ 10,000           $ 10,000  
Weighted average interest rate (as a percent)       4.00%           4.00%  
Promissory note | TAS Energy                      
Other disclosures                      
Outstanding balance       $ 8,000           $ 8,000  
Weighted average interest rate (as a percent)       3.50%           3.50%  
Promissory note | Electrical Contractor North Carolina                      
Other disclosures                      
Outstanding balance       $ 8,000           $ 8,000  
Weighted average interest rate (as a percent)       3.00%           3.00%  
Promissory note | Two Immaterial Acquisitions                      
Other disclosures                      
Outstanding balance       $ 100           $ 100  
Promissory note | Minimum | Two Immaterial Acquisitions                      
Other disclosures                      
Weighted average interest rate (as a percent)       3.00%           3.00%  
Letter of Credit                      
Debt Obligations                      
Borrowing capacity $ 160,000                    
Other debt                      
Other disclosures                      
Acquired debt       $ 20           $ 20