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	Mar. 31, 2017	Mar. 03, 2017
Schedule of Equity Method Investments [Line Items]
Carrying value of investment in Euro Infrastructure Co.	$ 141,894
Euro Infrastructure Co [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value of investment in Euro Infrastructure Co.		$ 141,894
Proportionate share of net assets of Euro Infrastructure Co.		127,393
Excess carrying value of investment over proportionate share of net assets		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		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		12,379
Euro Infrastructure Co [Member] | Tangible Asset [Member]
Schedule of Equity Method Investments [Line Items]
Excess carrying value of investment over proportionate share of net assets		(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		$ 1,572