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Debt Structure (Detail) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |
Total Outstanding Debt | $ 3,489,425 | $ 3,430,000
Debt Instrument, Interest Rate, Effective Percentage | 3.70% | 3.70%
Contract Maturity | Jan. 05, 2021 |
Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Total Outstanding Debt | $ 1,243,198 |
Debt Instrument, Interest Rate, Effective Percentage | 3.60% |
Contract Maturity | Mar. 26, 2019 |
Secured Debt [Member] | Mortgages [Member] | Fixed Rate Debt |  |
Debt Instrument [Line Items] |  |
Mortgage Loans on Real Estate | $ 975,330 |
Debt Instrument, Interest Rate, Effective Percentage | 4.00% |
Contract Maturity | Aug. 22, 2019 |
Secured Debt [Member] | Fixed Rate Debt |  |
Debt Instrument [Line Items] |  |
Total Outstanding Debt | $ 1,025,330 |
Debt Instrument, Interest Rate, Effective Percentage | 4.00% |
Contract Maturity | Jul. 11, 2019 |
Secured Debt [Member] | Variable Rate Debt |  |
Debt Instrument [Line Items] |  |
Total Outstanding Debt | $ 190,000 |
Debt Instrument, Interest Rate, Effective Percentage | 1.10% |
Contract Maturity | Aug. 26, 2017 |
Secured Debt [Member] | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Commitment Fee Percentage | 0.62% |
Debt Renewal Period | 90 days |
Line of Credit Facility, Amount Outstanding | $ 240,000 |
Secured Debt [Member] | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | Variable Rate Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.10% |
Contract Maturity | Aug. 26, 2017 |
Line of Credit Facility, Amount Outstanding | $ 190,000 |
Secured Debt [Member] | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | Fixed Rate Debt |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.70% |
Contract Maturity | Mar. 31, 2017 |
Line of Credit Facility, Amount Outstanding | $ 50,000 |
Secured Debt [Member] | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.10% |
Line of Credit Facility, Amount Outstanding | $ 190,000 |
Secured Debt [Member] | $750 million unsecured revolving credit facility [Member] | Fair Market Value Adjustment and Debt Issuance Cost [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | (19,019) |
Line of Credit Facility, Amount Outstanding | 27,868 |
Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Total Outstanding Debt | $ 2,246,227 |
Debt Instrument, Interest Rate, Effective Percentage | 3.70% |
Contract Maturity | Jan. 10, 2022 |
Unsecured Debt [Member] | $500 million unsecured revolving credit faciltiy [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.47% |
Unsecured Debt [Member] | $500 million unsecured revolving credit faciltiy [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.50% |
Contract Maturity | Apr. 15, 2020 |
Line of Credit Facility, Amount Outstanding | $ 180,000 |
Unsecured Debt [Member] | $750 million unsecured revolving credit facility [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Amount Outstanding | $ 180,000 |
Unsecured Debt [Member] | Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.10% |
Contract Maturity | Nov. 10, 2017 |
Debt Instrument, Face Amount | $ 550,000 |
Unsecured Debt [Member] | Senior Notes [Member] | Fixed Rate Debt |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.20% |
Contract Maturity | Sep. 16, 2023 |
Debt Instrument, Face Amount | $ 1,535,246 |
Maximum [Member] | Unsecured Debt [Member] | Fixed Rate Debt |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date, Description | 7.2 |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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