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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) |

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