Summary of Depreciation Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Real Estate and Accumulated Depreciation [Line Items]
Depreciation expense	$ 3,079	$ 3,494	$ 4,104
Building
Real Estate and Accumulated Depreciation [Line Items]
Depreciation expense	1,397	1,484	1,666
Furniture and Fixtures
Real Estate and Accumulated Depreciation [Line Items]
Depreciation expense	$ 1,682	$ 2,010	$ 2,438