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Schedule of Intangible Assets, Including Impact of Impairment Charges (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Finite Lived Intangible Assets [Line Items] |  |
Intangible Assets, Accumulated Amortization | $ (69,269) | $ (66,065)
Goodwill, Cost | 205,211 | 198,370
Goodwill, Net | 205,211 | 198,370
Total Goodwill and Intangible Assets, Cost | 308,611 | 301,570
Total Goodwill and Intangible Assets, Net | $ 239,342 | $ 235,505
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 | (58,732) | (56,303)
Intangible Assets, Net | $ 13,528 | $ 15,957
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 | $ 28,440
Intangible Assets, Accumulated Amortization | (8,037) | (7,262)
Intangible Assets, Net | $ 20,603 | $ 21,178

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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