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Stockholder's Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
May 31, 2015
Class Of Stock [Line Items]        
Common stock, shares authorized 190,000,000   190,000,000  
Common stock, par value $ 0.000004   $ 0.000004  
Stock issued on exercise of warrants 67,713 67,713    
Total unrecognized stock compensation expense related to unvested options and restricted stock granted under the Plans $ 173,100 $ 18,800    
Unrecognized expense expected to be recognized period 4 years      
Restricted shares became fully vested and released as common stock 25,289 36,817    
Shares, granted 25,289 36,817    
Stock compensation expense $ 10,425 $ 1,805    
Shares reserved for future issuance 8,772,532 5,992,019    
Restricted shares outstanding 2,064,197 281,705    
Shares of vested over period 1 year 1 year    
Supplemental Incentive Plans        
Class Of Stock [Line Items]        
Shares, granted 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 7,893,918 3,944,750 135,517  
Restricted shares forfeited 0 0    
Shares of vested over period     5 years  
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 1,239,697 579,260    
Two Thousand Seventeen Plan | Restricted Stock        
Class Of Stock [Line Items]        
Stock compensation expense $ 5,792 $ 182    
Two Thousand Seventeen Plan | Stock Options        
Class Of Stock [Line Items]        
Stock compensation expense 2,273 $ 1,610    
Two Thousand Seventeen Plan | Stock Appreciation Rights (SARs)        
Class Of Stock [Line Items]        
Shares, granted     3,000,000  
Stock compensation expense $ 2,360      
Exercise price     $ 66.79  
Shares of vested over period     5 years  
Remaining contractual terms 10 years      
Weighted average remaining contract life 9 years 8 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