Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ 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 (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Capitalized acquisition of proposed interim storage license.

+ References

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- Definition

Other assets non current.

+ References

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- Definition

Water delivery contract revenue percentage.

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- Definition

Duration in years for water delivery contract.

+ References

No definition available.

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Other Noncurrent Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2013
Other Assets Non Current [Line Items]
Contract related intangible asset impairment		$ 5.1
Real Estate Management And Development \| City Of Henderson
Other Assets Non Current [Line Items]
Delivery contract extended period	25 years
Water delivery contract revenue, percentage	70.00%
Real Estate Management And Development \| Customer Relationships
Other Assets Non Current [Line Items]
Indefinite-lived intangible asset			$ 5.1
Contract related intangible asset impairment		$ 5.1
WCS
Other Assets Non Current [Line Items]
Capitalized acquisition of proposed interim storage license	$ 3.3