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Senior Notes - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |  |
Average interest rate | 5.30% | 5.80% |
Notes issued which may not be redeemed prior to maturity | $ 82,200,000 |  |
Covenant terms | The fixed-rate senior notes and senior convertible 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 | The Company was in compliance with all of the financial and other covenants. | The Company was in compliance with all of the financial and other covenants. |
(Loss)gain on debt retirement, net | 0 | (13,495,000) | (89,000)
Senior Unsecured Notes due May 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior note principal amount | 300,000,000 |  |
Interest rate of senior notes | 3.375% |  |
Discount rate of Senior notes | 99.397% |  |
Debt Instrument, Maturity Date | May 15, 2023 |  |
Senior Unsecured Notes due January 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior note principal amount | 300,000,000 |  |
Interest rate of senior notes | 3.50% |  |
Discount rate of Senior notes | 99.327% |  |
Debt Instrument, Maturity Date | Jan. 15, 2021 |  |
Senior Convertible Notes due 2040 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Maturity Date | Nov. 15, 2040 |  |
Conversion price | $ 15.33 | $ 15.76 |
Trading days, minimum | 20 days |  |
Trading days, maximum | 30 days |  |
Conversion price per share greater than applicable trading day | 125.00% |  |
Remaining amortization periods for debt discount | 22 months |  |
Senior Unsecured Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Extinguishment of Debt, Amount |  | 60,000,000 | 36,100,000
(Loss)gain on debt retirement, net |  | (13,495,000) | (89,000)
Senior Convertible Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior note principal amount | 350,000,000 | 350,000,000 |
Senior convertible notes repurchased |  |  | $ 19,400,000

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