Accounts and Taxes Payable and Accrued Liabilities - Accounts and Income Taxes Payable (Detail) (USD $)	Mar. 31, 2014	Mar. 31, 2013
Payables And Accruals [Abstract]
Accounts payable	$ 17,437,000	$ 12,559,000
Income taxes payable	1,028,000	1,028,000
Accounts and taxes payable	$ 18,465,000	$ 13,587,000