Expiration Years of Minimum Alternate Tax Credit (Detail) - USD ($)	Jun. 30, 2015	Mar. 31, 2015
Tax Credit Carryforward [Line Items]
Less: valuation allowance	$ 0	$ (790,000)
Minimum Alternate Tax (MAT)
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	28,120,000
Less: valuation allowance	(1,640,000)
Total (net of valuation allowance)	26,480,000
Minimum Alternate Tax (MAT) | 2017-18
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	200,000
Minimum Alternate Tax (MAT) | 2018-19
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	280,000
Minimum Alternate Tax (MAT) | 2019-20
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	1,010,000
Minimum Alternate Tax (MAT) | 2020-21
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	1,690,000
Minimum Alternate Tax (MAT) | 2021-22
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	2,150,000
Minimum Alternate Tax (MAT) | 2022-23
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	6,220,000
Minimum Alternate Tax (MAT) | 2023-24
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	7,360,000
Minimum Alternate Tax (MAT) | 2024-25
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	7,760,000
Minimum Alternate Tax (MAT) | 2025-26 [Member]
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	$ 1,450,000