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Equity Method Investments and Related-Party Transactions - The Difference Between Carrying Value of Investment in Euro Infrastructure Co. and Proportionate Share of Net Assets of Euro Infrastructure Co. (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Mar. 31, 2017
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Schedule of Equity Method Investments [Line Items] |  |
Carrying value of investment in Euro Infrastructure Co. | $ 153,973 | $ 141,894
Euro Infrastructure Co [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Carrying value of investment in Euro Infrastructure Co. | 153,973 | 141,894
Less: proportionate share of net assets of Euro Infrastructure Co. | 138,313 | 127,393
Excess carrying value of investment over proportionate share of net assets | 15,660 | 14,501
Euro Infrastructure Co [Member] | Goodwill [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Excess carrying value of investment over proportionate share of net assets | 22,537 | 20,791
Euro Infrastructure Co [Member] | Identifiable Intangible Assets [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Excess carrying value of investment over proportionate share of net assets | 13,815 | 12,379
Euro Infrastructure Co [Member] | Tangible Assets [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Excess carrying value of investment over proportionate share of net assets | (22,411) | (20,241)
Euro Infrastructure Co [Member] | Deferred Income Taxes [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Excess carrying value of investment over proportionate share of net assets | $ 1,719 | $ 1,572

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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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