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Equity Method Investments and Related-Party Transactions - Schedule of Related Party Transactions (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2018
Euro Infrastructure Co [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue | $ 1,851 | $ 3,451 |
Expense | 2,159 | 1,831 |
Cash received | 2,430 | 2,071 |
Cash paid | 1,947 | $ 2,021 |
Accounts receivable | 2,167 |  | $ 3,307
Collections in excess of revenues and deferred revenues | 3,607 |  | 3,246
Ducommun Inc. [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Cash paid | 2,458 |  |
Accounts payable | $ 3,918 |  | $ 2,073

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