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Stockholder's Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
May 31, 2015
Class Of Stock [Line Items]            
Common stock, shares authorized 190,000,000   190,000,000   190,000,000  
Common stock, par value $ 0.000004   $ 0.000004   $ 0.000004  
Stock issued on exercise of warrants     67,713 67,713 [1]    
Total unrecognized stock compensation expense related to unvested options and restricted stock granted under the Plans $ 162,100 $ 16,400 $ 162,100 $ 16,400    
Unrecognized expense expected to be recognized period     4 years      
Restricted shares became fully vested and released as common stock 0 2,112 25,289 38,929    
Shares, granted [1]   2,112 25,289 38,929    
Stock compensation expense $ 10,932 $ 2,416 $ 21,357 $ 4,221    
Shares reserved for future issuance 8,647,620 5,992,019 8,647,620 5,992,019    
Restricted shares outstanding 2,064,197 286,239 2,064,197 286,239    
Shares of vested over period 1 year 1 year 1 year 1 year    
Supplemental Incentive Plans            
Class Of Stock [Line Items]            
Shares, granted     95,404 0    
Montrose Amended & Restated 2017 Stock Incentive Plan            
Class Of Stock [Line Items]            
Shares, granted         1,671,391  
Share based, description         These RSUs represent the right to receive one share of the Company’s common stock upon vesting. These incentives were designed by the Board, in coordination with the Company’s compensation advisors, to (i) retain selected employees of the Company for a minimum of 5 years, (ii) reward selected employees for the Company’s significant outperformance and stockholder value creation in 2021, and (iii) provide incentives to selected employees of the Company to accelerate value creation for stockholders and other stakeholders over the next five-year period  
Stock compensation expense         $ 90,000  
Shares reserved for future issuance 7,769,931 3,944,750 7,769,931 3,944,750 135,517  
Restricted shares forfeited 0 0 0 0    
Shares of vested over period         5 years  
Montrose Amended & Restated 2017 Stock Incentive Plan | Restricted Stock            
Class Of Stock [Line Items]            
Shares RSAs granted 0 4,534 10,920 19,066    
Montrose Amended & Restated 2017 Stock Incentive Plan | Stock Options | Board of Directors            
Class Of Stock [Line Items]            
Shares of vested over period     4 years      
Montrose Amended & Restated 2017 Stock Incentive Plan | Stock Options | Executive Officers            
Class Of Stock [Line Items]            
Shares of vested over period     3 years      
Vesting frequency of period     1 year      
Montrose Amended & Restated 2017 Stock Incentive Plan | Stock Options | Second Anniversary | Board of Directors            
Class Of Stock [Line Items]            
Shares, vesting rights, percentage     50.00%      
Montrose Amended & Restated 2017 Stock Incentive Plan | Stock Options | Fourth Anniversary | Board of Directors            
Class Of Stock [Line Items]            
Shares, vesting rights, percentage     50.00%      
Montrose Amended & Restated 2017 Stock Incentive Plan | Performance-Vested RSUs            
Class Of Stock [Line Items]            
Shares, granted         316,209  
Shares, vesting rights, percentage         50.00%  
Montrose Amended & Restated 2017 Stock Incentive Plan | RSUs            
Class Of Stock [Line Items]            
Shares, granted         1,355,182  
Shares, vesting rights, percentage         50.00%  
Montrose Amended and Restated 2013 Stock Option Plan            
Class Of Stock [Line Items]            
Shares outstanding from exercised options 1,243,272 673,350 1,243,272 673,350    
Two Thousand Seventeen Plan | Restricted Stock            
Class Of Stock [Line Items]            
Stock compensation expense $ 6,017 $ 330 $ 11,809 $ 512    
Two Thousand Seventeen Plan | Stock Options            
Class Of Stock [Line Items]            
Stock compensation expense 2,625 $ 2,080 4,898 $ 3,690    
Two Thousand Seventeen Plan | Stock Appreciation Rights (SARs)            
Class Of Stock [Line Items]            
Shares, granted         3,000,000  
Stock compensation expense $ 2,290   $ 4,650      
Exercise price         $ 66.79  
Shares of vested over period         5 years  
Remaining contractual terms     10 years      
Weighted average remaining contract life     9 years 5 months 15 days      
Fair value vested in period     $ 46,000      
Private Offering            
Class Of Stock [Line Items]            
Warrants to purchase common stock           116,350
Warrant exercise price per share           $ 17.19
[1] Represents the non-cash release of common shares due to the exercise of warrants and the vesting of restricted stock.