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Summary of the Fair Value Estimates of the Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	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

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+ References

No definition available.

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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

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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

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