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Other Noncurrent Assets - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 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 |  | $ 5.1 |

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- Definition 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 + Details
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- Details
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