Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended			0 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended	12 Months Ended	0 Months Ended	1 Months Ended	6 Months Ended								3 Months Ended		6 Months Ended						1 Months Ended	3 Months Ended	6 Months Ended				6 Months Ended			0 Months Ended	6 Months Ended	0 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Sep. 28, 2014 Subsequent Event [Member] Land	Sep. 30, 2014 Subsequent Event [Member]	Sep. 15, 2014 Subsequent Event [Member]	Mar. 31, 2014 Subsequent Event [Member] Letter Agreement [Member]	Jun. 30, 2013 PEAKS Guarantee [Member]	Dec. 31, 2012 PEAKS Guarantee [Member]	Oct. 09, 2014 PEAKS Guarantee [Member] Subsequent Event [Member]	Dec. 31, 2014 PEAKS Guarantee [Member] Subsequent Event [Member]	Jun. 30, 2013 Minimum [Member]	Jun. 30, 2013 Maximum [Member]	Jun. 30, 2013 For the period from September 15, 2014 through and including March 21, 2015 [Member]	Jun. 30, 2013 For the period from March 22, 2015 through and including March 21, 2016 [Member]	Jun. 30, 2013 For the period from March 22, 2016 through and including March 21, 2017 [Member]	Jun. 30, 2013 For the period from March 22, 2017 through and including March 21, 2018 [Member]	Jun. 30, 2013 For the period from March 22, 2018 through and including March 21, 2019 [Member]	Jun. 30, 2013 For the period from March 22, 2019 through November 15, 2019 [Member]	Jun. 30, 2013 Credit Agreement [Member]	Jun. 30, 2012 Credit Agreement [Member]	Jun. 30, 2013 Credit Agreement [Member]	Jun. 30, 2012 Credit Agreement [Member]	Mar. 21, 2012 Credit Agreement [Member]	Jun. 30, 2013 Amended Credit Agreement [Member]	Jun. 30, 2013 Amended Credit Agreement [Member] Minimum [Member]	Jun. 30, 2013 Amended Credit Agreement [Member] Maximum [Member]	Feb. 28, 2013 PEAKS Senior Debt [Member]	Jun. 30, 2013 PEAKS Senior Debt [Member]	Jun. 30, 2013 PEAKS Senior Debt [Member]	Jan. 31, 2010 PEAKS Senior Debt [Member]	Jun. 30, 2013 PEAKS Senior Debt [Member] Minimum [Member]	Jun. 30, 2013 J P Morgan Chase Bank [Member]	Jun. 30, 2013 First Amendment [Member] Credit Agreement [Member]	Jun. 30, 2013 Second Amendment [Member] Credit Agreement [Member]	Jun. 30, 2013 Third Amendment [Member] Credit Agreement [Member]	Jul. 30, 2014 Fourth Amendment [Member] Subsequent Event [Member]	Jun. 30, 2013 Fourth Amendment [Member] Credit Agreement [Member]	Jul. 30, 2014 Secured Debt [Member] Fourth Amendment [Member] Subsequent Event [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity																										$ 325,000
Credit agreement amended date																																				Mar. 31, 2014	May 29, 2014	Jun. 30, 2014		Jul. 30, 2014
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
Borrowings under credit Agreement																						120,000		120,000
Effective interest rate on borrowings																						3.30%	2.70%	3.30%	2.10%
Commitment fee under the New Credit Agreement																								0.40%
The ticking fee rate																0.00%	1.00%	2.00%	3.00%	4.00%	5.00%
Number of mortgages parcels of land owned						30
Percentage of cash collateral amount equal to face amount								109.00%
Percentage of cash collateral amount equal to face amount of ED Letter of Credit								103.00%
Amended Credit Agreement before reduction																																							75,000
Amended Credit Agreement after reduction																																							5,000
Net cash proceeds from Mortgaged Property																																							75.00%
Sale and leaseback transaction																																							125,000
Secured indebtedness before reduction																																							25,000		25,000
Secured indebtedness After reduction																																							5,000		5,000
Aggregate principal amount of debt																															300,000	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										1.40				1.05	1.40
Payments under PEAK Guarantee							51,700		40,000	60,340	12,342	50,000	159,500
Aggregate Principal Amount																														257,533		256,900
Current liability	102,695	0	102,695	0	0																										102,695	102,695
Estimated fair value of senior debt																														226,096
Difference in Estimated Fair Value and Outstanding Principal Amount																														31,437
Effective Interest Rate																															9.60%	10.30%
Interest Expense	973	1,115	1,986	1,662																											6,256	8,678
Amortization of discount																															$ 1,382	$ 2,033