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Segment Financial Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue for Reportable Segment |  |  |  |  |  |  |  |  | $ 712,600 | $ 668,776 | $ 564,633
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  |  |  |  |  |  |  | 75,208 | 61,848 | 40,009
Operations expenses |  |  |  |  |  |  |  |  | (355,650) | (328,472) | (287,283)
Income from segment operations |  |  |  |  |  |  |  |  | 356,950 | 340,304 | 277,350
Interest income |  |  |  |  |  |  |  |  | 7,770 | 7,689 | 5,641
Income from operations |  |  |  |  |  |  |  |  | 254,551 | 206,443 | 176,852
Reconciliation to Net income available for Common Shares |  |  |  |  |  |  |  |  |  |  |
Corporate Interest Income |  |  |  |  |  |  |  |  | 490 | 446 | 283
General and administrative |  |  |  |  |  |  |  |  | (7,515) | (6,795) | (6,452)
Transaction costs |  |  |  |  |  |  |  |  | (37,844) | 0 | 0
Interest and related amortization |  |  |  |  |  |  |  |  | (28,211) | (26,388) | (42,046)
Rent Control Initiatives Expenses and Other |  |  |  |  |  |  |  |  | (2,771) | (1,456) | (2,043)
Interest Expense, Debt |  |  |  |  |  |  |  |  | (118,522) | (123,992) | (99,489)
Equity in income of unconsolidated joint ventures |  |  |  |  |  |  |  |  | 2,039 | 1,899 | 1,948
Consolidated income from continuing operations | 28,713 | 34,936 | 21,786 | 40,470 | 29,015 | 21,492 | 6,298 | 17,654 | 77,247 | 63,747 | 41,957
Consolidated net income |  |  |  |  |  |  |  |  | 125,905 | 74,459 | 42,504
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  |  |  |  |  |  | 41,525 | 4,596 | 0
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax |  |  |  |  |  |  |  |  | 7,133 | 6,116 | 547
Total Assets | 3,391,639 |  |  |  | 3,398,226 |  |  |  | 3,391,639 | 3,398,226 | 3,496,101
Assets of Disposal Group, Including Discontinued Operation | 0 |  |  |  | 119,852 |  |  |  | 0 | 119,852 | 122,328
Capital Improvements |  |  |  |  |  |  |  |  | 64,714 | 75,260 | 62,032
Real Estate Depreciation Expense and Rental Homes |  |  |  |  |  |  |  |  | (108,229) | (102,083) | (83,013)
Amortization of Intangible Assets for Continuing Operations |  |  |  |  |  |  |  |  | 1,940 | 39,467 | 23,126
Property Operations segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue for Reportable Segment |  |  |  |  |  |  |  |  | 679,319 | 647,731 | 550,529
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  |  |  |  |  |  |  | 350,524 | 336,037 | 274,945
Operations expenses |  |  |  |  |  |  |  |  | (328,795) | (311,694) | (275,584)
Income from segment operations |  |  |  |  |  |  |  |  | 350,524 | 336,037 | 274,945
Interest income |  |  |  |  |  |  |  |  | 3,397 | 3,075 | 3,377
Income from operations |  |  |  |  |  |  |  |  | 250,607 | 203,999 | 176,801
Reconciliation to Net income available for Common Shares |  |  |  |  |  |  |  |  |  |  |
Total Assets | 3,096,156 |  |  |  |  |  |  |  | 3,096,156 |  |
Capital Improvements |  |  |  |  |  |  |  |  | 26,430 | 30,863 | 26,224
Real Estate Depreciation Expense and Rental Homes |  |  |  |  |  |  |  |  | (101,374) | (96,419) | (78,838)
Amortization of Intangible Assets for Continuing Operations |  |  |  |  |  |  |  |  | 1,940 | 38,694 | 22,683
Home Sales and Rentals Operations segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue for Reportable Segment |  |  |  |  |  |  |  |  | 33,281 | 21,045 | 14,104
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  |  |  |  |  |  |  | 6,426 | 4,267 | 2,405
Operations expenses |  |  |  |  |  |  |  |  | (26,855) | (16,778) | (11,699)
Income from segment operations |  |  |  |  |  |  |  |  | 6,426 | 4,267 | 2,405
Interest income |  |  |  |  |  |  |  |  | 4,373 | 4,614 | 2,264
Income from operations |  |  |  |  |  |  |  |  | 3,944 | 2,444 | 51
Reconciliation to Net income available for Common Shares |  |  |  |  |  |  |  |  |  |  |
Total Assets | 295,483 |  |  |  |  |  |  |  | 295,483 |  |
Capital Improvements |  |  |  |  |  |  |  |  | 38,284 | 44,397 | 35,808
Real Estate Depreciation Expense and Rental Homes |  |  |  |  |  |  |  |  | (6,855) | (5,664) | (4,175)
Amortization of Intangible Assets for Continuing Operations |  |  |  |  |  |  |  |  | 0 | 773 | 443
Maximum |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  | 2 |  |
Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation to Net income available for Common Shares |  |  |  |  |  |  |  |  |  |  |
Total Assets |  |  |  |  | 3,278,374 |  |  |  |  | 3,278,374 | 3,373,773
Continuing Operations [Member] | Property Operations segment |  |  |  |  |  |  |  |  |  |  |
Reconciliation to Net income available for Common Shares |  |  |  |  |  |  |  |  |  |  |
Total Assets |  |  |  |  | 2,984,766 |  |  |  |  | 2,984,766 | 3,172,222
Continuing Operations [Member] | Home Sales and Rentals Operations segment |  |  |  |  |  |  |  |  |  |  |
Reconciliation to Net income available for Common Shares |  |  |  |  |  |  |  |  |  |  |
Total Assets |  |  |  |  | $ 293,608 |  |  |  |  | $ 293,608 | $ 201,551

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