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Equity Method Investments and Related-Party Transactions - Schedule of Related Party Transactions (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018
Euro Infrastructure Co [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue | $ 1,327 | $ 2,177 | $ 3,178 | $ 5,628 |
Expense | 2,432 | 1,757 | 4,590 | 3,588 |
Cash received | 3,624 | 2,278 | 6,054 | 4,349 |
Cash paid | 2,145 | $ 1,989 | 4,092 | $ 4,009 |
Accounts receivable |  |  |  |  | $ 3,307
Collections in excess of revenues and deferred revenues | 4,007 |  | 4,007 |  | 3,246
Accounts payable | 1,379 |  | 1,379 |  |
Ducommun Inc. [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Cash paid | 4,521 |  | 6,979 |  |
Accounts payable | $ 6,684 |  | $ 6,684 |  | $ 2,073

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