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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
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Jul. 31, 2013 | Jul. 31, 2012 | Jul. 31, 2013 | Jul. 31, 2012
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Management agreement, initial term |  |  | 20 years |
Number of major customers | 2 | 3 | 2 | 3
Customer A | Two Major Customers |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Percentage Of Accounts Receivable From Customers | 16.90% |  | 16.90% |
Revenue Of Major Customers Percentage Of Total Revenue |  | 15.80% |  | 16.80%
Customer A | Three Major Customers |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Revenue Of Major Customers Percentage Of Total Revenue |  | 25.80% |  | 26.00%
Customer B | Two Major Customers |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Percentage Of Accounts Receivable From Customers | 9.50% |  | 9.50% |
Revenue Of Major Customers Percentage Of Total Revenue |  | 15.70% |  | 16.10%
Customer B | Three Major Customers |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Revenue Of Major Customers Percentage Of Total Revenue |  | 11.00% |  | 10.70%
Customer C | Three Major Customers |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Revenue Of Major Customers Percentage Of Total Revenue |  | 10.70% |  | 9.70%

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- Definition Number of customers + References No definition available. + Details
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- Definition Percentage of accounts receivable from customers + References No definition available. + Details
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- Definition Revenue of major customers percentage of total revenue + References No definition available. + Details
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- Definition Service Agreement Term + References No definition available. + Details
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- Details
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