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Supplemental Cash Flow Information - Additional Information (Detail) (USD $)
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1 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | ||||
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Jun. 30, 2013
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2011
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Sep. 30, 2013
Real Estate Properties
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Sep. 30, 2012
Real Estate Properties
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Sep. 30, 2013
Spirit
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Jul. 17, 2013
Spirit
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| Schedule Of Supplemental Cash Flow [Line Items] | ||||||||
| Assets acquired net | $ 1,740,000,000 | |||||||
| Equity interests issued | 2,030,000,000 | |||||||
| Repayment of mortgages and notes payable | 33,339,000 | 31,594,000 | 149,200,000 | 2,600,000 | ||||
| Proceeds from dispositions of real estate and other assets | 135,270,000 | 19,736,000 | 148,200,000 | |||||
| Surrendered real estate property totaling | 6,900,000 | |||||||
| Mortgage note payable | 7,900,000 | |||||||
| Common stock dividend declared | 50,200,000 | |||||||
| Deferred offering costs | 1,100,000 | 5,200,000 | ||||||
| Converted debt | 330,000,000 | |||||||
| Repayment of acquisition costs | $ 700,000 | |||||||