Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Summary Of Significant Accounting Policies [Line Items]
Management agreement, initial term	20 years
Number of major customers	3
Customer A
Summary Of Significant Accounting Policies [Line Items]
Percentage Of Accounts Receivable From Customers	26.00%
Revenue Of Major Customers Percentage Of Total Revenue	18.00%	26.00%
Customer B
Summary Of Significant Accounting Policies [Line Items]
Percentage Of Accounts Receivable From Customers	10.00%
Revenue Of Major Customers Percentage Of Total Revenue	18.00%	10.00%
Customer C
Summary Of Significant Accounting Policies [Line Items]
Percentage Of Accounts Receivable From Customers	10.00%
Revenue Of Major Customers Percentage Of Total Revenue	17.00%	9.00%