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Schedule of Intangible Assets, Including Impact of Impairment Charges (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Finite Lived Intangible Assets [Line Items]    
Intangible Assets, Cost $ 469,657 $ 469,657
Intangible Assets, Accumulated Amortization (88,522) (81,759)
Goodwill, Cost 329,137 329,137
Goodwill, Additions 51,574  
Goodwill, Net 380,711 329,137
Goodwill and Intangible Assets, Additions 84,908  
Goodwill and Intangible Assets, net 466,043 387,898
Goodwill, Net $ 380,711 $ 329,137
Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangible Assets, Useful Life   25 years
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 $ 108,610 $ 108,610
Intangible Assets, Additions 32,584  
Intangible Assets, Accumulated Amortization (75,413) (69,866)
Intangible Assets, Net 65,781 38,744
Permits [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangible Assets, Cost 30,410 30,410
Intangible Assets, Additions 350  
Intangible Assets, Accumulated Amortization (12,519) (11,629)
Intangible Assets, Net $ 18,241 $ 18,781
Permits [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangible Assets, Useful Life 25 years  
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 $ 1,500
Intangible Assets, Additions 400  
Intangible Assets, Accumulated Amortization (590) (264)
Intangible Assets, Net $ 1,310 $ 1,236