Basis of Presentation and New Accounting Pronouncements - Additional Information (Detail) |
Sep. 30, 2015 |
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Variable Interest Entity, Primary Beneficiary [Member] | |
Basis Of Presentation [Line Items] | |
Direct ownership percentage in joint venture | 75.00% |
Unnamed Corporate Joint Venture [Member] | |
Basis Of Presentation [Line Items] | |
Equity method ownership percentage in joint venture | 37.50% |