Subsequent Events - Additional Information (Details) - USD ($)				1 Months Ended		3 Months Ended	12 Months Ended
	Apr. 27, 2021	Apr. 01, 2021	Apr. 13, 2020	Jan. 31, 2021	Apr. 30, 2020	Mar. 31, 2021	Dec. 31, 2020
Subsequent Event [Line Items]
Number of common stock shares issued in connection with business acquisition						71,740
Cash							$ 175,450,000
Credit facility maturity date			Apr. 30, 2025
Incremental Term Loans
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity			$ 100,000,000
CTEH
Subsequent Event [Line Items]
Number of common stock shares issued in connection with business acquisition					791,139
Cash							$ 175,000,000
MSE Group
Subsequent Event [Line Items]
Number of common stock shares issued in connection with business acquisition						71,740
Cash				$ 9,082,000
Subsequent Event | 2021 Credit Facility
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	$ 300,000,000
Credit facility maturity date	Apr. 27, 2026
Percentage of interest rate adjustment	0.05%
Maximum net leverage ratio	425.00%
Maximum net leverage ratio year two	400.00%
Maximum net leverage ratio year three	375.00%
Minimum fixed charge coverage ratio	125.00%
Subsequent Event | Incremental Term Loans
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	$ 150,000,000
Subsequent Event | Term Loan Facility | 2021 Credit Facility
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	175,000,000
Subsequent Event | Revolving Line of Credit | 2021 Credit Facility
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	125,000,000
Subsequent Event | Revolving Line of Credit | Letter of Credit | 2021 Credit Facility
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	$ 20,000,000
Subsequent Event | CTEH
Subsequent Event [Line Items]
Number of common stock shares issued in connection with business acquisition		539,607
Shares issued, price per share		$ 46.33
Cash		$ 25,000,000
Subsequent Event | MSE Group
Subsequent Event [Line Items]
Number of common stock shares issued in connection with business acquisition		24,200
Shares issued, price per share		$ 44.81
Cash		$ 8,000,000