Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended											0 Months Ended	12 Months Ended		12 Months Ended						12 Months Ended		1 Months Ended	12 Months Ended		0 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2013 Land	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 For the period from September 15, 2014 through and including March 21, 2015 [Member]	Dec. 31, 2013 For the period from March 22, 2015 through and including March 21, 2016 [Member]	Dec. 31, 2013 For the period from March 22, 2016 through and including March 21, 2017 [Member]	Dec. 31, 2013 For the period from March 22, 2017 through and including March 21, 2018 [Member]	Dec. 31, 2013 For the period from March 22, 2018 through and including March 21, 2019 [Member]	Dec. 31, 2013 For the period from March 22, 2019 through November 15, 2019 [Member]	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]	Feb. 28, 2013 PEAKS Senior Debt [Member]	Dec. 31, 2013 PEAKS Senior Debt [Member]	Jan. 31, 2010 PEAKS Senior Debt [Member]	Dec. 31, 2013 Credit Agreement [Member]	Dec. 31, 2012 Credit Agreement [Member]	Dec. 31, 2011 Credit Agreement [Member]	Mar. 21, 2012 Credit Agreement [Member]	Dec. 31, 2013 Amended Credit Agreement [Member]	Dec. 31, 2013 Amended Credit Agreement [Member] Minimum [Member]	Dec. 31, 2013 Amended Credit Agreement [Member] Maximum [Member]	Dec. 31, 2013 2014 Payment [Member] Letter Agreement [Member]	Apr. 30, 2013 PEAKS Guarantee [Member]	Dec. 31, 2012 PEAKS Guarantee [Member]	Dec. 31, 2013 PEAKS Guarantee [Member] 2014 Payment [Member]	Oct. 09, 2014 Subsequent Event [Member] PEAKS Guarantee [Member]	Sep. 30, 2014 Subsequent Event [Member] PEAKS Guarantee [Member]	Dec. 31, 2013 J P Morgan Chase Bank [Member]	Dec. 31, 2013 First Amendment [Member] Credit Agreement [Member]	Dec. 31, 2013 Second Amendment [Member] Credit Agreement [Member]	Dec. 31, 2013 Third Amendment [Member] Credit Agreement [Member]	Dec. 31, 2013 Fourth Amendment [Member]	Dec. 31, 2013 Fourth Amendment [Member] Minimum [Member]	Dec. 31, 2013 Fourth Amendment [Member] Credit Agreement [Member]	Dec. 31, 2013 Fifth Amendment [Member] Credit Agreement [Member]
Line of Credit Facility [Line Items]
Aggregate principal amount																		$ 325,000																$ 25,000
Credit agreement amended date																													Mar. 31, 2014	May 29, 2014	Jun. 30, 2014			Jul. 30, 2014	Mar. 21, 2015
Revised maximum borrowing capacity																			135,000
Letter of credit agreement borrowing capacity																				25,000	85,000							2,352
Decrease in letter of credit agreement borrowing capacity	100,000
Effective interest rate on borrowings															3.60%	2.40%	1.20%
Commitment fee under the New Credit Agreement															0.40%
Interest expense	3,424	3,303	1,825										21,288
Ticking fee rate				0.00%	1.00%	2.00%	3.00%	4.00%	5.00%
Number of parcels, land	30
Number of days delay imposed by ED	5 days
Cash collateral, percentage	103.00%
Percentage of cash collateral amount equal to face amount	109.00%
Line of credit, amount																																75,000
Decrease in line of credit																																5,000
Percentage of net cash proceeds from Mortgaged Property																																	75.00%
Net cash proceeds received																					125,000
Aggregate principal amount																																		5,000
Borrowings under credit agreement															50,000
Senior debt in the aggregate principal amount													300,000	300,000
Debt instrument maturity date													Jan. 31, 2020
Variable rate percentage													5.50%
Minimum LIBOR rate applied													2.00%
Required Asset/Liability ratio										1.05	1.40												0.0140
Payments under PEAK Guarantee																						40,000	60,340	12,342	159,500	50,000	51,700
Outstanding balance												257,533	255,600
Debt instrument carrying amount													229,224
Current portion of PEAKS Trust senior debt	157,883	0											157,883
Estimated fair value of senior debt												226,096
Difference in Estimated Fair Value and Outstanding Principal Amount												31,437
Effective Interest Rate													9.90%
Amortization of discount													$ 4,926