Fair Value of Financial Instruments - Summary of Fair Value Information of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest and rent receivables	$ 58,499	$ 45,289
Loans	351,607	334,693
Debt, net	(1,421,681)	(1,025,160)
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest and rent receivables	44,349	36,700
Loans	358,277	335,595
Debt, net	$ (1,486,090)	$ (1,082,333)