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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
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6 Months Ended | |
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Jun. 30, 2014
segment
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Dec. 31, 2013
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| Summary Of Significant Accounting Policies [Line Items] | ||
| Allowance for doubtful accounts | $ 5,400,000 | $ 4,600,000 |
| Assets | 7,500,907,000 | 7,231,045,000 |
| Liabilities | 4,238,559,000 | 4,113,011,000 |
| Number of segments | 1 | |
| Accounts receivable | 18,800,000 | 14,300,000 |
| Provision for losses | 10,800,000 | 9,600,000 |
| Accrued rental revenue receivables | 42,000,000 | 35,300,000 |
| Allowance for loan losses | 0 | 0 |
| Loan placed on non accrual status, past due days | 60 days | |
| Provision for income taxes | 0 | |
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Mortgages
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| Summary Of Significant Accounting Policies [Line Items] | ||
| Loans on non accruals status | 0 | 0 |
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Notes
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| Summary Of Significant Accounting Policies [Line Items] | ||
| Loans on non accruals status | 0 | 0 |
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Special Purpose Entity
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| Summary Of Significant Accounting Policies [Line Items] | ||
| Assets | 6,300,000,000 | 6,100,000,000 |
| Liabilities | $ 3,300,000,000 | $ 3,800,000,000 |