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Equity Method Investments and Related-Party Transactions - Schedule of Related Party Transactions (Detail) - Euro Infrastructure Co [Member] $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($)
Related Party Transaction [Line Items] |  |
Revenue | $ 2,177 | $ 5,628
Expense | 1,757 | 3,588
Cash received | 2,278 | 4,349
Cash paid | 1,989 | 4,009
Accounts receivable | 1,910 | 1,910
Collections in excess of revenues and deferred revenues | $ 2,971 | $ 2,971

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