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Schedule of Intangible Assets, Including Impact of Impairment Charges (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Accumulated Amortization $ (77,342) $ 170,041  
Goodwill, Cost 331,592 198,371  
Goodwill, Additions (2,455) 133,221  
Goodwill, Net 329,137 331,592 $ 129,127
Total Goodwill and Intangible Assets, Cost 469,312 299,271  
Goodwill and Intangible Assets, Additions 345    
Goodwill and Intangible Assets, net 392,315 396,463  
Goodwill, Net $ 329,137 331,592 $ 129,127
Goodwill and Intangible Assets, Impairment   $ (72,849)  
Maximum [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Useful Life   40 years  
Customer Contracts And Relationships [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Useful Life 15 years 15 years  
Intangible Assets, Cost $ 105,810 $ 72,260  
Intangible Assets, Additions 2,800    
Intangible Assets, Accumulated Amortization (66,445) 33,550  
Intangible Assets, Net 42,165 42,860  
Intangible Assets, Impairment   $ (62,950)  
Permits [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Cost 30,410    
Intangible Assets, Accumulated Amortization (10,759)    
Intangible Assets, Net $ 19,651    
Permits [Member] | Minimum [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Useful Life 25 years 25 years  
Intangible Assets, Cost   $ 28,640  
Intangible Assets, Accumulated Amortization   1,770  
Intangible Assets, Net   20,521  
Intangible Assets, Impairment   $ (9,889)  
Permits [Member] | Maximum [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Useful Life 40 years    
Trade Name [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Useful Life 15 years 15 years  
Intangible Assets, Cost $ 1,500    
Intangible Assets, Accumulated Amortization (138) $ 1,500  
Intangible Assets, Net $ 1,362 1,490  
Goodwill, Net   1,490  
Goodwill and Intangible Assets, net   1,490  
Intangible Assets, Impairment   (10)  
Intangible Assets, Impairment   (10)  
Goodwill, Net   1,490  
Goodwill and Intangible Assets, Impairment   $ (10)