Summary of Significant Accounting Policies - Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 127,491	$ 133,619	$ 141,217
Less - Accumulated depreciation and amortization	(101,716)	(106,556)	(113,664)
Net property, plant and equipment	25,775	27,063	27,553
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	2,508	2,508	2,508
Buildings, Leasehold Interests and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	35,445	37,183	37,202
Machinery, Equipment and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 89,538	$ 93,928	$ 101,507