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Unsecured and Secured Indebtedness - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
Repayment of senior notes | $ 958,509 | $ 240,000 | $ 502,996
Senior notes, Weighted Average Interest Rate | 4.20% | 4.90% |
Covenant terms | The fixed-rate senior notes were issued pursuant to indentures that contain certain covenants, including limitation on incurrence of debt, maintenance of unencumbered real estate assets and debt service coverage. The covenants also require that the cumulative dividends declared or paid from December 31, 1993, through the end of the current period cannot exceed Funds From Operations (as defined in the agreement) plus an additional $20.0 million for the same period unless required to maintain REIT status. |  |
Covenant compliance | At December 31, 2017 and 2016, the Company was in compliance with all of the financial and other covenants under the indentures. |  |
Payment of debt issuance costs | $ 7,295 | $ 43 | 4,605
Gross fees paid for revolving credit facilities and term loans | 1,900 | $ 1,800 | $ 2,300
Mortgage Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Net book value of investments and real estate collateralizing mortgages payable | $ 900,000 |  |
Mortgage Payable [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate | 3.40% |  |
Mortgage Payable [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate | 9.80% |  |
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Payment of debt issuance costs | $ 2,000 |  |
Unsecured Debt [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured term loan | $ 400,000 |  |
Covenant compliance | Company was in compliance with these financial covenants at December 31, 2017 and 2016 |  |
Unsecured Debt [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] | LIBOR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Specified spread line of credit facility | 1.35% |  |
3.9% Senior Unsecured Notes Due August 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes issued | $ 350,000 |  |
Debt Instrument, Interest Rate | 3.90% |  |
Debt instrument maturity date | 2024-08 |  |
4.7% Senior Unsecured Notes Due June 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes issued | $ 450,000 |  |
Debt Instrument, Interest Rate | 4.70% |  |
Debt instrument maturity date | 2027-06 |  |
7.875% Senior Unsecured Notes Due September 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate | 7.875% |  |
Debt instrument maturity date | 2020-09 |  |
Repayment of senior notes | $ 300,000 |  |
4.75% Senior Unsecured Notes Due April 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate | 4.75% |  |
Debt instrument maturity date | 2018-04 |  |
Repayment of senior notes | $ 300,000 |  |
7.875% Senior Unsecured Notes Due September 2020 and 4.75% Senior Unsecured Notes Due April 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Payment on redemption of senior notes | $ 58,500 |  |
Senior Unsecured Notes due July 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument maturity date | 2018-07 |  |
Senior notes issued which may not be redeemed prior to maturity | $ 82,200 |  |
Tranche A Loans [Member] | Unsecured Debt [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured term loan | $ 200,000 |  |
Term loan maturity date | 2018-04 |  |
Extension maturity period | with two one-year extension options |  |
Tranche B Loans [Member] | Unsecured Debt [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured term loan | $ 200,000 |  |
Term loan maturity date | 2023-01 |  |
Secured Term Loan with Key Bank National Association [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Covenant compliance | The Company was in compliance with these financial covenants at December 31, 2016. |  |
Secured Term Loan with Key Bank National Association [Member] | LIBOR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Specified spread line of credit facility |  | 1.35% |

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