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Basis of Presentation and New Accounting Pronouncements - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017	Sep. 30, 2017
Basis Of Presentation [Line Items]
Sale of minority interest percentage	75.00%
Unnamed Corporate Joint Venture [Member]
Basis Of Presentation [Line Items]
Equity method ownership percentage in joint venture		37.50%

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- Definition

Basis Of Presentation [Line Items]

+ References

No definition available.

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- Definition

Sale of minority interest percentage.

+ References

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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