Stockholders' Equity - Schedule of Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted, shares	[1]	90,815	25,532	42,263
Montrose 2017 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted, shares				1,671,391
Awards granted, Average Price per Share		$ 14	$ 16	$ 23
Montrose 2017 Stock Incentive Plan | Restricted stock units awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted, shares		793,133	106,324	1,690,700
Awards forfeited, shares		(11,311)
Awards vested, Shares		90,815	25,532	42,263
Awards granted, Average Price per Share		$ 34.33	$ 46.82	$ 66.45
Awards forfeited, Average Price per Share		32.13
Awards vested, Average Price per Share		$ 36.77	$ 31.27	$ 30.68
Awards granted, Total		$ 27,231	$ 4,978	$ 112,347
Awards forfeited, Total		363
Awards vested, Total		$ 3,339	$ 798,470	$ 1,296,522

[1] Represents the non-cash release of shares of common stock due to the exercise of warrants and the vesting of restricted stock