Borrowing Arrangements - Additional Information (Detail) (USD $)	3 Months Ended		3 Months Ended			1 Months Ended		1 Months Ended			3 Months Ended			3 Months Ended		3 Months Ended
	Mar. 31, 2014 Rate Property	Dec. 31, 2013 Property	Mar. 31, 2014 Old Credit Facilities [Member] Property	Mar. 31, 2014 Amended Line of Credit Facility	Apr. 02, 2014 Subsequent Event [Member]	Apr. 30, 2014 Subsequent Event [Member] Old Credit Facilities [Member]	Apr. 02, 2014 Subsequent Event [Member] Old Credit Facilities [Member] Property	Apr. 30, 2014 Subsequent Event [Member] New Credit Facilities [Member]	Apr. 02, 2014 Subsequent Event [Member] New Credit Facilities [Member] Property	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2014 Minimum [Member] Amended Line of Credit Facility Rate	Apr. 02, 2014 Minimum [Member] Subsequent Event [Member] New Credit Facilities [Member]	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2014 Maximum [Member] Amended Line of Credit Facility Rate	Apr. 02, 2014 Maximum [Member] Subsequent Event [Member] New Credit Facilities [Member]	Mar. 31, 2014 Term Loans	Mar. 31, 2014 Term Loans Minimum [Member] Rate	Mar. 31, 2014 Term Loans Maximum [Member] Rate	Mar. 31, 2014 R V Resort [Member] New Credit Facilities [Member]	Mar. 31, 2014 R V Resort [Member] Minimum [Member] New Credit Facilities [Member]	Mar. 31, 2014 R V Resort [Member] Maximum [Member] New Credit Facilities [Member]
Debt Instrument [Line Items]
Unsecured Debt	$ 200,000,000	$ 200,000,000
Debt Instrument, Maturity Date																Jun. 30, 2017
Mortgage notes payable	1,976,426,000	1,992,368,000
Debt, Weighted Average Interest Rate	5.30%								4.54%
Debt, minimum interest rate	3.90%
Debt, maximum interest rate	8.90%
Debt, maturity year										2014		2034	2038		2038					2017	2018
Secured Debt Refinancing Plan					430,000,000
Proceeds from Issuance of Long-term Debt								54,000,000
Number of pledge properties	144	147	5				5		4
Carrying values of properties encumbered	2,403,000,000	2,378,000,000
Repayments of Long-term Debt			20,700,000			31,900,000
Debt Instrument, Interest Rate, Stated Percentage			5.63%				5.63%												6.48%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt																			13,300,000
Debt Instrument, Unamortized Discount (Premium), Net																			1,000,000
Debt instrument, interest rate based on margin over LIBOR											1.40%			2.00%			1.85%	2.80%
Start date to repay debt without penalty on prepayment																Jul. 01, 2014
Debt, percentage of prepayment penalty																2.00%
Derivative, Maturity Years																3 years
Lines of credit, borrowing capacity	$ 380,000,000	$ 380,000,000
Lines of credit, maturity date				Sep. 15, 2016
Line of credit facility, interest rate based on margin over LIBOR	Our LOC bears a LIBOR rate plus a maximum of 1.40% to 2.00%, contains a 0.25% to 0.40% facility fee and has a maturity date of September 15, 2016. We have a one year extension option under our LOC.
Lines of credit, extension option				1 year
Line of credit, facility rate											0.25%			0.40%