Related Party Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Jun. 30, 2015	Mar. 31, 2015	Jul. 09, 2014	Aug. 31, 2012	Mar. 02, 2010
Related Party Transaction [Line Items]
Extraordinary dividend declared					$ 1.10
Company's assertion as to the percent of the dividend that is taxable to the recipient					4.90%
Internal Revenue Service's assertion as to the percent of the dividend that is taxable to the recipient, which the company is refuting				100.00%
Restricted cash	$ 500	$ 500
Estimated additional taxes, penalties and interest	$ 4,900
Grande
Related Party Transaction [Line Items]
Grande's (Provisional Liquidator Appointed) Ownership Interest in Emerson number of shares			15,243,283
Grande's (Provisional Liquidator Appointed) Ownership Interest Percentage			56.20%