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Commitments and Contingencies - Outstanding Capital Commitments Associated with Investments in Unconsolidated Affiliates (Detail) (Corporate Joint Venture [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Corporate Joint Venture [Member]
 
Other Commitments [Line Items]  
Capital commitments, Remainder of 2015 $ 4,293us-gaap_OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
Capital commitments, 2016 8,406us-gaap_OtherCommitmentDueInSecondYear
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
Capital commitments, 2017 33,830us-gaap_OtherCommitmentDueInThirdYear
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
Capital commitments, 2018 0us-gaap_OtherCommitmentDueInFourthYear
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
Capital commitments, 2019 24,977us-gaap_OtherCommitmentDueInFifthYear
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
Capital commitments, thereafter 0us-gaap_OtherCommitmentDueAfterFifthYear
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
Total capital commitments associated with investments in unconsolidated affiliated related to an EPC electrical transmission project $ 71,506us-gaap_OtherCommitment
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember