Financial Instruments and Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Asset impairment charges	$ 374,800,000	$ 5,080,000	$ 2,551,000	$ 377,325,000
Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value inputs, discount rate		10.00%
Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value inputs, discount rate		20.00%
Income Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Asset impairment charges		4,911,000
Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Asset impairment charges		169,000
Cost Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Asset impairment charges			2,551,000
Fair Value, Measurements, Nonrecurring | Level 3 | Income Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment in real estate, net		2,420,000
Fair Value, Measurements, Nonrecurring | Level 3 | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment in real estate, net		722,000
Fair Value, Measurements, Nonrecurring | Level 3 | Cost Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment in real estate, net			300,000
Fair Value, Measurements, Nonrecurring | Level 3 | Real Estate Investment | Income Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value inputs, discount rate		14.00%
Fair value inputs, cap rate		11.80%
Fair Value, Measurements, Nonrecurring | Level 3 | Real Estate Investment | Income Approach Valuation Technique | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value inputs, estimated revenue		0
Fair Value, Measurements, Nonrecurring | Level 3 | Real Estate Investment | Income Approach Valuation Technique | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value inputs, estimated revenue		0
Fair Value, Measurements, Nonrecurring | Level 3 | Real Estate Investment | Market Approach Valuation Technique | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value inputs, estimated selling price		700,000
Fair Value, Measurements, Nonrecurring | Level 3 | Real Estate Investment | Market Approach Valuation Technique | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value inputs, estimated selling price		$ 900,000
Fair Value, Measurements, Nonrecurring | Level 3 | Real Estate Investment | Cost Approach Valuation Technique | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value inputs, price per square acre			33,000
Fair Value, Measurements, Nonrecurring | Level 3 | Real Estate Investment | Cost Approach Valuation Technique | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value inputs, price per square acre			105,000