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Commitments and Contingencies - Outstanding Capital Commitments Associated with Investments in Unconsolidated Affiliates (Detail) - Corporate Joint Venture [Member]
$ in Thousands
Sep. 30, 2015
USD ($)
Other Commitments [Line Items]  
Capital commitments, Remainder of 2015 $ 2,530
Capital commitments, 2016 8,010
Capital commitments, 2017 32,238
Capital commitments, 2018 0
Capital commitments, 2019 23,801
Capital commitments, thereafter 0
Total capital commitments associated with investments in unconsolidated affiliated related to an EPC electrical transmission project $ 66,579