Investment in Unconsolidated Affiliates - Summarized Financial Data of Joint Ventures (Detail) - USD ($) $ in Thousands	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Investments in and Advances to Affiliates [Line Items]
Investment in unconsolidated affiliates	$ 25,038	$ 23,624	$ 21,899
South American Joint Venture [Member]
Investments in and Advances to Affiliates [Line Items]
Investment in unconsolidated affiliates	17,081	18,422
Receivable from unconsolidated joint venture	5,607	8,313
BaySaver [Member]
Investments in and Advances to Affiliates [Line Items]
Investment in unconsolidated affiliates	4,906	5,202
Receivable from unconsolidated joint venture	59	$ 6
Tigre-ADS USA [Member]
Investments in and Advances to Affiliates [Line Items]
Investment in unconsolidated affiliates	3,051
Receivable from unconsolidated joint venture	$ 27