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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  | 3 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended
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Sep. 14, 2012 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2013 Maximum integer | Dec. 31, 2013 Minimum | Dec. 31, 2013 Fair Value, Inputs, Level 2 | Dec. 31, 2012 Fair Value, Inputs, Level 2 | Dec. 31, 2013 Florida | Dec. 31, 2012 Florida | Dec. 31, 2011 Florida | Dec. 31, 2013 Arizona | Dec. 31, 2012 Arizona | Dec. 31, 2011 Arizona | Dec. 31, 2013 California | Dec. 31, 2012 California | Dec. 31, 2011 California | Dec. 31, 2013 Chattel Loans | Dec. 31, 2013 Chattel Loans Maximum | Dec. 31, 2013 Buildings and structural and land improvements | Dec. 31, 2013 Building Improvements | Dec. 31, 2013 Furniture, Fixtures and Equipment | Dec. 31, 2013 Real Estate Rate | Dec. 31, 2013 Preferred Stock | Dec. 31, 2012 Cumulative Series Eight Point Zero Three Four Percent Redeemable Perpetual Preferred Stock [Member] | Oct. 18, 2012 Cumulative Series Eight Point Zero Three Four Percent Redeemable Perpetual Preferred Stock [Member] | Dec. 31, 2013 Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member] | Dec. 31, 2012 Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member] | Sep. 14, 2012 Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member] | Dec. 31, 2013 Purchase Price Allocation Adjustments | Dec. 31, 2013 Identified Intangible Assets [Member] | Dec. 31, 2012 Identified Intangible Assets [Member]
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  | $ 88,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 88,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowances and Reserves, Balance |  | 7,927,000 |  |  |  | 6,987,000 |  |  |  | 7,700,000 |  |  |  |  | 7,927,000 | 6,987,000 | 7,700,000 | 6,580,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary Income Dividends Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.680 | $ 0.810 | $ 0.563 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable Default Rate |  | 16.00% |  |  |  |  |  |  |  |  |  |  |  |  | 16.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable Recovery Rate |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid |  | Jan. 10, 2014 | Oct. 11, 2013 | Jul. 12, 2013 | Apr. 12, 2013 | Dec. 28, 2012 | Oct. 12, 2012 | Jul. 13, 2012 | Apr. 13, 2012 | Jan. 13, 2012 | Oct. 14, 2011 | Jul. 08, 2011 | Apr. 08, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment percentage to apply cost method accounting, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets, Net (Including Goodwill) |  | 12,100,000 |  |  |  | 12,100,000 |  |  |  |  |  |  |  |  | 12,100,000 | 12,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Final Adjustment Period Maximum Range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 years | 10 years | 5 years | 20 years |  |  |  |  |  |  |  |  |
Intangible assets |  | 4,300,000 |  |  |  | 4,300,000 |  |  |  |  |  |  |  |  | 4,300,000 | 4,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 7,800,000 |  |  |  | 7,800,000 |  |  |  |  |  |  |  |  | 7,800,000 | 7,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization of identified intangible assets |  | 1,900,000 |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  | 1,900,000 | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,940,000 | 45,122,000 | 28,479,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 | 300,000
Cash and cash equivalents, restricted cash |  | 5,200,000 |  |  |  | 4,900,000 |  |  |  |  |  |  |  |  | 5,200,000 | 4,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization for deferred financing costs |  | 25,400,000 |  |  |  | 20,500,000 |  |  |  |  |  |  |  |  | 25,400,000 | 20,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-Controlling Interests - Common OP Units |  | 7,667,723 |  |  |  | 7,456,320 |  |  |  | 8,206,134 |  |  |  |  | 7,667,723 | 7,456,320 | 8,206,134 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment in real estate U.S federal tax basis |  | 2,700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment in notes receivable U.S federal tax basis |  | 47,700,000 |  |  |  |  |  |  |  |  |  |  |  |  | 47,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, amortization term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 years | 28 years |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000,000 | 2,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for uncollectable rents receivable |  | 4,900,000 |  |  |  | 4,700,000 |  |  |  |  |  |  |  |  | 4,900,000 | 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income recognition period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of company revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.70% | 39.40% | 38.50% | 9.80% | 9.40% | 10.80% | 15.70% | 15.20% | 17.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue, estimated period of recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31 years | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right-to-use properties contract, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private REIT Subsidiaries preferred stock |  | 69,872,000 |  |  |  | 65,054,000 |  |  |  |  |  |  |  |  | 69,872,000 | 65,054,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.75% |  |  |  |  |
Perpetual Preferred OP Units conversion |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (200,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly distribution paid per common share |  | $ 0.2500 | $ 0.2500 | $ 0.2500 | $ 0.2500 | $ 0.2188 | $ 0.2188 | $ 0.2188 | $ 0.2188 | $ 0.1875 | $ 0.1875 | $ 0.1875 | $ 0.1875 |  | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid, Taxable |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0413 | $ 0.2087 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  | 9,945,164 |  |  |  | 9,945,539 |  |  |  |  |  |  |  |  | 9,945,164 | 9,945,539 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54,461 | 54,461 | 54,458 |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  | $ 2,500.00 |  |  |
Peferred Stock, Shares Exchanged | 5,445,765 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary Shares, Issued | 5,445,765 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary Share, Liquidation Preference Per Share | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount | $ 0.3849625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0948460 |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,554,235 |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64,100,000 |  |  |  |  |  |  |
Capital Gains Dividends Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.211 | $ 0.069 | $ 0.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nondividend Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.000 | $ 0.186 | $ 0.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecaptured Section 1250 Gain Dividends Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.067 | $ 0.000 | $ 0.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Dividends Per Share Tax Treatment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.958 | $ 1.065 | $ 0.563 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowances and Reserves, Charged to Cost and Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,152,000 | 4,860,000 | 4,156,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowances and Reserves, Deductions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (4,212,000) | $ (5,573,000) | $ (3,036,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition The value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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