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Note 1 - Summary of Significant Accounting Policies (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Economic Interest | 100.00% |  |
Financing Receivable, Past Due, Term | 90 days |  |
Number of Portfolio Segments | 1 |  |
Restricted Cash and Cash Equivalents (in Dollars) | $ 4.0 | $ 5.6 |
Capitalized Computer Software, Net (in Dollars) | 26.8 | 23.8 |
Capitalized Computer Software, Amortization (in Dollars) | $ 5.5 | $ 3.1 | $ 1.9
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) | 11,159,160 | 13,304,016 | 12,085,874
Restricted Stock Awards, Method of Calculation, Number of Classes | 2 |  |
Number of Equity Participation Plans | 2 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) | 8,871,495 | 5,776,270 | 5,874,704
Number of Amendment Types | 2 |  |
Number of Statements | 2 |  |
The Home Depot [Member] | Base Rental Revenue [Member] |  |  |
Concentration Risk, Percentage | 3.00% |  |
TJX Companies [Member] | Base Rental Revenue [Member] |  |  |
Concentration Risk, Percentage | 2.90% |  |
Wal-Mart [Member] | Base Rental Revenue [Member] |  |  |
Concentration Risk, Percentage | 2.60% |  |
Sears Holdings [Member] | Base Rental Revenue [Member] |  |  |
Concentration Risk, Percentage | 2.00% |  |
Bed Bath & Beyond [Member] | Base Rental Revenue [Member] |  |  |
Concentration Risk, Percentage | 1.70% |  |
Prior Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) | 47,000,000 |  |
The 2010 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) | 10,000,000 |  |
Stock Options [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 5 years |  |
Stock Options [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Expiration Period | 10 |  |
Restricted Stock [Member] | First Half [Member] | iii [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percent Vested | 50.00% |  |
Restricted Stock [Member] | Second Half [Member] | iii [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 2 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percent Vested | 50.00% |  |
Restricted Stock [Member] | i [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percent Vested | 100.00% |  |
Restricted Stock [Member] | ii [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |
Restricted Stock [Member] | ii [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Restricted Stock [Member] | iii [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Restricted Stock [Member] | iv [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 10 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percent Vested | 20.00% |  |
Largest [Member] |  |  |
Number of Tenants |  | 5 |
Potential Adjustment [Member] |  |  |
Number of Years | 1 |  |
Construction Completion [Member] |  |  |
Number of Years | 1 |  |
Cash Equivalents Policy [Member] |  |  |
Number of Months | 3 |  |
After Issuance [Member] |  |  |
Number of Years | 1 |  |
Base Rental Revenue [Member] |  |  |
Concentration Risk, Percentage | 1.70% |  |
Gross Leasable Area [Member] |  |  |
Concentration Risk, Percentage | 1.20% |  |
Maximum [Member] | Computer Software, Intangible Asset [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |
Maximum [Member] |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 100.00% |
Minimum [Member] | Computer Software, Intangible Asset [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |

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