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Borrowing Arrangements - Additional Information (Detail) (USD $) | 3 Months Ended |  | 3 Months Ended | 9 Months Ended | 1 Months Ended |  |  | 9 Months Ended | 1 Months Ended |  | 9 Months Ended | 1 Months Ended | 3 Months Ended
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Mar. 31, 2013 Rate integer | Sep. 30, 2012 | Dec. 31, 2012 | Mar. 31, 2013 Old Credit Facilities [Member] | Sep. 30, 2012 OriginalLineOfCreditFacitlity [Member] | Jul. 31, 2012 Amended Line of Credit Facility | Apr. 30, 2013 Subsequent Event [Member] Old Credit Facilities [Member] | Apr. 02, 2013 Subsequent Event [Member] Old Credit Facilities [Member] | Mar. 31, 2013 Minimum | Sep. 30, 2012 Minimum OriginalLineOfCreditFacitlity [Member] Rate | Jul. 31, 2012 Minimum Amended Line of Credit Facility Rate | Mar. 31, 2013 Maximum | Sep. 30, 2012 Maximum OriginalLineOfCreditFacitlity [Member] Rate | Jul. 31, 2012 Maximum Amended Line of Credit Facility Rate | Mar. 31, 2013 Term Loans | Mar. 31, 2013 Term Loans Minimum Rate | Mar. 31, 2013 Term Loans Maximum Rate
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Document Period End Date | Mar. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable | $ 2,051,435,000 |  | $ 2,069,866,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable, weighted average interest rate | 5.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, minimum interest rate | 3.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, maximum interest rate | 8.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, maturity year |  |  |  |  |  |  |  |  | 2013 |  |  | 2023 |  |  |  |  |
Number of pledge properties | 170 |  | 171 | 1 |  |  |  | 1 |  |  |  |  |  |  |  |  |
Carrying values of properties encumbered | 2,478,000,000 |  | 2,494,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2017 |  |
Repayments of Long-term Debt |  |  |  | 8,300,000 |  |  | 4,600,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.30% |  |  |  | 7.30% |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |
Debt, extension option period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Debt instrument, interest rate based on margin over LIBOR |  |  |  |  |  |  |  |  |  | 1.65% | 1.40% |  | 2.50% | 2.00% |  | 1.85% | 2.80%
Start date to repay debt without penalty on prepayment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 01, 2014 |  |
Debt, percentage of prepayment penalty |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |
LIBOR Swap Agreement, period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Lines of credit, borrowing capacity | 380,000,000 |  | 380,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lines of credit, maturity date |  |  |  |  | Sep. 18, 2015 | Sep. 15, 2016 |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest rate based on margin over LIBOR | we amended our LOC to (i) decrease the per annum interest rate to LIBOR plus a maximum of 1.40% to 2.00%, bearing a facility rate of 0.25% to 0.40%, (ii) extend the maturity of the LOC to September 15, 2016, (iii) lengthen the extension option to one year, and (iv) effect other minor changes. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, facility fee |  |  |  |  |  |  |  |  |  | 0.30% |  |  | 0.40% |  |  |  |
Lines of credit, extension option |  |  |  |  | 8 months | 1 year |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Amount |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit, amended date | Jul. 20, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, facility rate |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  | 0.40% |  |  |

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