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Summary of the Fair Value Estimates of the Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Permits [Member] |  |
Business Acquisition [Line Items] |  |
Intangible Assets, Useful Life |  | 40 years
Kosmos Acquisition [Member] | Estimated Fair Value [Member] |  |
Business Acquisition [Line Items] |  |
Estimated Fair Value | $ 35,500 |
Kosmos Acquisition [Member] | Permits [Member] |  |
Business Acquisition [Line Items] |  |
Intangible Assets, Useful Life | 20 years |
Kosmos Acquisition [Member] | Permits [Member] | Estimated Fair Value [Member] |  |
Business Acquisition [Line Items] |  |
Estimated Fair Value | $ 1,500 |
Kosmos Acquisition [Member] | Customer Relationships [member] |  |
Business Acquisition [Line Items] |  |
Intangible Assets, Useful Life | 15 years |
Kosmos Acquisition [Member] | Customer Relationships [member] | Estimated Fair Value [Member] |  |
Business Acquisition [Line Items] |  |
Estimated Fair Value | $ 32,500 |
Kosmos Acquisition [Member] | Trade Name and Technology [member] |  |
Business Acquisition [Line Items] |  |
Intangible Assets, Useful Life | 10 years |
Kosmos Acquisition [Member] | Trade Name and Technology [member] | Estimated Fair Value [Member] |  |
Business Acquisition [Line Items] |  |
Estimated Fair Value | $ 1,500 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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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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- Details
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