Quarterly report pursuant to Section 13 or 15(d)

The Company - Schedule of Investments in Equity Method Affiliates (Detail)

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The Company - Schedule of Investments in Equity Method Affiliates (Detail) - JPMorgan [Member] - USD ($)
$ in Millions
Jun. 30, 2015
May. 31, 2015
Apr. 30, 2015
Oct. 31, 2014
Strong Upwind Holdings I LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Project investment amount $ 141 $ 144   $ 141
Strong Upwind Holdings II LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Project investment amount     $ 36