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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2013 | Oct. 31, 2012 | Oct. 31, 2013 | Oct. 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 | 16.20% |  | 16.20% |
Revenue Of Major Customers Percentage Of Total Revenue | 15.40% |  | 16.30% |
Customer A | Three Major Customers |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Revenue Of Major Customers Percentage Of Total Revenue |  | 20.80% |  | 24.00%
Customer B | Two Major Customers |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Percentage Of Accounts Receivable From Customers | 9.70% |  | 9.70% |
Revenue Of Major Customers Percentage Of Total Revenue | 15.00% |  | 15.50% |
Customer B | Three Major Customers |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Revenue Of Major Customers Percentage Of Total Revenue |  | 6.30% |  | 7.70%
Customer C | Three Major Customers |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Revenue Of Major Customers Percentage Of Total Revenue |  | 4.20% |  | 4.90%

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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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