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Schedule of Intangible Assets, Including Impact of Impairment Charges (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Finite Lived Intangible Assets [Line Items] |  |
Intangible Assets, Accumulated Amortization | $ (72,477) | $ (69,269)
Goodwill, Cost | 205,211 | 205,211
Intangible Assets, Impairment | (6,841) |
Goodwill, Net | 198,370 | 205,211
Total Goodwill and Intangible Assets, Cost | 308,611 | 308,611
Goodwill and Intangible Assets, Impairment | (7,019) |
Goodwill and Intangible Assets, net | $ 229,115 | $ 239,342
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, Accumulated Amortization | (61,009) | (58,732)
Intangible Assets, Impairment | (178) |
Intangible Assets, Net | $ 11,073 | $ 13,528
Sales Contracts [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible Assets, Useful Life | 4 years | 4 years
Intangible Assets, Cost | $ 2,500 | $ 2,500
Intangible Assets, Accumulated Amortization | $ (2,500) | $ (2,500)
Permits [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible Assets, Useful Life | 40 years | 40 years
Intangible Assets, Cost | $ 28,640 | $ 28,640
Intangible Assets, Accumulated Amortization | (8,968) | (8,037)
Intangible Assets, Net | $ 19,672 | $ 20,603

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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