Stockholder's Equity - Schedule of Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted, Shares	[1]	144,251	90,116
Montrose 2017 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted, Average Price per Share			$ 13.9
Montrose 2017 Stock Incentive Plan | Restricted stock units awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted, Shares		259,118	464,186
Awards forfeited, Shares		(14,336)
Awards granted, Average Price per Share		$ 39.65	$ 32.62
Awards forfeited, Average Price per Share		$ 37.04
Awards granted, Fair Value		$ 10,273	$ 15,140
Awards forfeited, Fair Value		$ 531

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