Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Outstanding Capital Commitments Associated with Investments in Unconsolidated Affiliates (Parenthetical) (Detail)

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Commitments and Contingencies - Outstanding Capital Commitments Associated with Investments in Unconsolidated Affiliates (Parenthetical) (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2015
USD ($)
Corporate Joint Venture [Member]  
Other Commitments [Line Items]  
Return of capital from unconsolidated affiliates anticipated for 2017 $ 45.3