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Schedule of Intangible Assets, Including Impact of Impairment Charges (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 06, 2020
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Accumulated Amortization $ (72,849) $ (72,477)  
Goodwill, Cost 198,371 205,211  
Goodwill, Additions 133,221    
Goodwill, Net 331,592 198,370 $ 131,582
Total Goodwill and Intangible Assets, Cost 299,271 308,611  
Goodwill and Intangible Assets, Additions 170,041    
Goodwill and Intangible Assets, net 396,463 229,115  
Intangible Assets, Impairment   (6,841)  
Goodwill, Net $ 331,592 198,370 $ 131,582
Goodwill and Intangible Assets, Impairment   $ (7,019)  
Customer Contracts And Relationships [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Useful Life 15 years 15 years  
Intangible Assets, Cost $ 72,260 $ 72,260  
Intangible Assets, Additions 33,550    
Intangible Assets, Accumulated Amortization (62,950) (61,009)  
Intangible Assets, Net 42,860 11,073  
Intangible Assets, Impairment   $ (178)  
Permits [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Useful Life   40 years  
Intangible Assets, Cost 28,640 $ 28,640  
Intangible Assets, Additions 1,770    
Intangible Assets, Accumulated Amortization (9,889) (8,968)  
Intangible Assets, Net $ 20,521 $ 19,672  
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    
Intangible Assets, Additions $ 1,500    
Intangible Assets, Accumulated Amortization (10)    
Intangible Assets, Net $ 1,490    
Sales Contracts [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible Assets, Useful Life   4 years  
Intangible Assets, Cost   $ 2,500  
Intangible Assets, Accumulated Amortization   $ (2,500)