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Unsecured and Secured Indebtedness - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Nov. 30, 2015 USD ($) $ / Note shares
Debt Instrument [Line Items] |  |  |  |
Senior notes, Weighted Average Interest Rate | 4.90% | 5.20% |  |
Senior notes issued which may not be redeemed prior to maturity | $ 82,200,000 |  |  |
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, 2016 and 2015, the Company was in compliance with all of the financial and other covenants under the indentures. |  |  |
Total fees, excluding underwriting discounts, incurred for the issuance of senior notes | $ 43,000 | $ 4,605,000 | $ 1,046,000 |
Gross fees paid for revolving credit facilities and term loans | 1,800,000 | 2,300,000 | $ 1,900,000 |
Mortgage Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Net book value of investments and real estate collateralizing mortgages payable | $ 1,500,000,000 |  |  |
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% |  |  |
Secured Term Loan with Key Bank National Association [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loan maturity date | 2017-04 |  |  |
Extension maturity period | P1Y |  |  |
Covenant compliance | The Company was in compliance with these financial covenants at December 31, 2016 and 2015. |  |  |
Extended maturity date | 2018-04 |  |  |
LIBOR [Member] | Secured Term Loan with Key Bank National Association [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Specified spread line of credit facility | 1.35% |  |  |
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total fees, excluding underwriting discounts, incurred for the issuance of senior notes |  | $ 2,000,000 |  |
Senior Convertible Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior convertible notes aggregate principal amount outstanding at maturity |  |  |  | $ 350,000,000
Conversion price, common shares per 1000 principal amount of senior convertible notes | shares |  |  |  | 9.0311
Principal amount of senior convertible notes | $ / Note |  |  |  | 1,000
Conversion of convertible notes | shares |  |  |  | 3,200,000
Unsecured Debt [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured term loan | $ 400,000,000 |  |  |
Term loan maturity date | 2017-04 |  |  |
Accordion feature | $ 600,000,000 |  |  |
Extension maturity period | with three one-year borrower options |  |  |
Covenant compliance | Company was in compliance with these financial covenants at December 31, 2016 and 2015 |  |  |
Unsecured Debt [Member] | LIBOR [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Specified spread line of credit facility | 1.10% |  |  |

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