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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) |

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