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

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- Definition Forecasted returns of capital from unconsolidated affiliates in two years. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |