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Derivative Instruments - Narrative (Details) |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |
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Nov. 17, 2015 USD ($) | Apr. 01, 2015 USD ($) | Mar. 04, 2015 USD ($) | Aug. 22, 2013 USD ($) | Jul. 31, 2013 USD ($) | Feb. 11, 2011 USD ($) | Sep. 30, 2016 USD ($) derivative | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) derivative | Sep. 30, 2015 USD ($) | Jul. 31, 2016 | Jul. 01, 2016 | Jun. 01, 2016 | May 03, 2016 USD ($) | Dec. 31, 2015 USD ($) derivative | May 01, 2015 | Aug. 21, 2013 USD ($) | Jan. 11, 2012 | Mar. 16, 2011
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  | $ 2,427,440,000 |  | $ 2,427,440,000 |  |  |  |  |  | $ 2,278,445,000 |  |  |  |
Derivative assets |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  | 2,061,000 |  |  |  |
Derivative liabilities |  |  |  |  |  |  | 22,413,000 |  | 22,413,000 |  |  |  |  |  | 2,010,000 |  |  |  |
Cash flow hedge adjustment |  |  |  |  |  |  |  |  | 7,700,000 |  |  |  |  |  |  |  |  |  |
Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  | 2,061,000 |  |  |  |
Derivative liabilities |  |  |  |  |  |  | 22,413,000 |  | 22,413,000 |  |  |  |  |  | 2,010,000 |  |  |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  | 1,845,000,000 |  | $ 1,845,000,000 |  |  |  |  |  | 1,555,000,000 |  |  |  |
5 Year Term Loan Facility 2015 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of loan facility |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5 Year Term Loan Facility 2015 | Unsecured Debt | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted interest rate |  |  |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  | 2.66% |  |  |
5 Year Term Loan Facility 2015 | Unsecured Debt | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted interest rate |  |  |  |  |  |  |  |  |  |  |  | 3.65% |  |  |  | 3.56% |  |  |
New Credit Agreement - Term Loan | Unsecured Debt | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Credit Agreement - Term Loan | Unsecured Debt | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
7 Year Term Loan Facility 2015 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of loan facility |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
7 Year Term Loan Facility 2015 | Unsecured Debt | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted interest rate |  |  |  |  |  |  |  |  |  |  |  | 3.36% |  |  |  | 3.21% |  |  |
7 Year Term Loan Facility 2015 | Unsecured Debt | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted interest rate |  |  |  |  |  |  |  |  |  |  |  | 4.31% |  |  |  | 4.16% |  |  |
7-Year Term Loan due November 2022 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of loan facility | 7 years |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |
Face amount | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  | $ 125,000,000 |  | $ 125,000,000 |  |  |  |  |  | $ 0 |  |  |  |
7-Year Term Loan due November 2022 | Unsecured Debt | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.03% |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 1.60% |  |  |  |  |  |  |  |  |  |
7-Year Term Loan due November 2022 | Unsecured Debt | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.98% |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 2.55% |  |  |  |  |  |  |  |  |  |
Sunset Gower Sunset Bronson |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of loan facility |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  | $ 97,000,000 |  | $ 92,000,000 |  |  |  |  |  |  |  |  |  |  | $ 92,000,000 |  |
Increase in borrowing capacity |  |  | $ 160,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sunset Gower Sunset Bronson | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.25% |  | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Met Park North |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of loan facility |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted interest rate |  |  |  |  |  |  | 3.71% |  | 3.71% |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  | $ 64,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Met Park North | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Cap | Sunset Gower Sunset Bronson | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate cap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% | 3.715%
Interest Rate Cap | Sunset Gower Sunset Bronson, Loan A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of interest rate cash flow hedge derivatives |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  | 5.97% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Cap | Sunset Gower Sunset Bronson, Loan B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of interest rate cash flow hedge derivatives |  |  |  | $ 42,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  | 4.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Contract | 5 Year Term Loan Facility 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.36% |  |  |
Interest Rate Contract | 7 Year Term Loan Facility 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.61% |  |  |
Unrealized gain on ineffective portion of derivative instruments |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |
Unrealized loss on ineffective portion of derivative instruments |  |  |  |  |  |  |  | $ 0 | $ 1,600,000 | $ 0 |  |  |  |  |  |  |  |  |
Interest Rate Contract | 7-Year Term Loan due November 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.43% |  |  |  |  |
Interest Rate Contract | Met Park North | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate cap |  |  |  |  | 2.16% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Floor | 5 Year Term Loan Facility 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, interest rate floor |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |
Interest Rate Floor | 7-Year Term Loan due November 2022 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, interest rate floor |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |
Designated as Hedging Instrument | Interest Rate Cap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of derivative instruments held | derivative |  |  |  |  |  |  | 6 |  | 6 |  |  |  |  |  | 2 |  |  |  |
Notional amount of interest rate cash flow hedge derivatives |  |  |  |  |  |  | $ 839,500,000 |  | $ 839,500,000 |  |  |  |  |  | $ 92,000,000 |  |  |  |
Designated as Hedging Instrument | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of derivative instruments held | derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Notional amount of interest rate cash flow hedge derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 714,500,000 |  |  |  |

X
- Definition Debt Instrument, Increase In Borrowing Capacity + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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- Definition Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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- Definition The portion of gains on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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