Quarterly report pursuant to Section 13 or 15(d)

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

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Commitments and Contingencies - Outstanding Capital Commitments Associated with Investments in Unconsolidated Affiliates (Detail) - Corporate Joint Venture [Member]
$ in Thousands
Jun. 30, 2015
USD ($)
Other Commitments [Line Items]  
Capital commitments, Remainder of 2015 $ 3,326
Capital commitments, 2016 8,534
Capital commitments, 2017 34,345
Capital commitments, 2018 0
Capital commitments, 2019 25,357
Capital commitments, thereafter 0
Total capital commitments associated with investments in unconsolidated affiliated related to an EPC electrical transmission project $ 71,562