Debt - Additional Information (Detail) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Oct. 01, 2009 Promissory_Notes	May 30, 2014	Dec. 31, 2014
Line of Credit Facility [Line Items]
Debt outstanding	$ 357,500,000				$ 358,200,000
Mortgage notes payable	97,520,000				98,205,000
Interest expense	5,901,000	3,327,000
Amortization of deferred financing costs	547,000	175,000
Amortization of debt discount		30,000
Interest payable	5,600,000				1,700,000
Johnson Land Enterprises, LLC [Member] | Promissory Notes September 30, 2019 [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount			10,000,000
Mortgage notes payable	500,000
Number of promissory notes			4,000,000
Interest rate			6.00%
Ensign [Member]
Line of Credit Facility [Line Items]
Debt outstanding	359,512,000
General Electric Capital Corporation [Member]
Line of Credit Facility [Line Items]
Advances included in mortgage note payable	49,800,000
General Electric Capital Corporation [Member] | Mortgage Notes Payable due May 30, 2017 [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount	47,200,000
Debt instrument, maturity date	May 30, 2017
Mortgage notes payable	97,000,000
Advances included in mortgage note payable				50,700,000
Debt instrument interest rate , terms	This advance bears interest at a floating rate equal to three month LIBOR plus 3.35%, reset monthly and subject to a LIBOR floor of 0.50%, with monthly principal and interest payments based on a 25 year amortization.
Debt instrument blended interest rate	7.25%
Debt instrument payment amortization period	25 years
Debt instrument, extension options period	12 months
Debt instrument, number of extension options	2
Extension fees equal percent on outstanding principal balance	0.25%
General Electric Capital Corporation [Member] | Mortgage Notes Payable due May 30, 2017 [Member] | Floor [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread	0.50%
General Electric Capital Corporation [Member] | Mortgage Notes Payable due May 30, 2017 [Member] | Floating Rate [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread	3.35%
Senior Unsecured Notes [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount				260,000,000
Debt instrument, interest rate				5.875%
Gross proceeds from issuance notes				260,000,000
Net proceeds from issuance of notes				253,000,000
Debt instrument, maturity date	Jun. 01, 2021
Frequency of interest payable on notes	Interest on the Notes is payable on June 1 and December 1 of each year, beginning on December 1, 2014.
Debt instrument, redemption price, percentage				100.00%
Debt instrument, redemption price, percentage upon change of control				101.00%
Debt instrument, early redeemable date	Jun. 01, 2017
Senior Unsecured Notes [Member] | Ensign [Member]
Line of Credit Facility [Line Items]
Approximate amount transferred from net proceeds				220,800,000
Senior Unsecured Notes [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Redeemable percentage of aggregate principal amount of notes				35.00%
Senior Unsecured Notes [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Percentage of aggregate principal amount of notes outstanding				65.00%
Senior Secured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity				150,000,000
Line of credit facility, additional borrowing capacity				75,000,000
Line of credit facility, maturity date	May 30, 2018
Line of credit facility, extension period	1 year
Line of credit amount outstanding	0
Line of credit facility, commitment fee	$ 200,000
Senior Secured Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument, interest rate effective percentage rate minimum				2.00%
Debt instrument, interest rate effective percentage rate maximum				2.50%
Debt instrument, basis spread				1.00%
Senior Secured Revolving Credit Facility [Member] | Floor [Member]
Line of Credit Facility [Line Items]
Debt instrument, interest rate effective percentage rate minimum				1.00%
Debt instrument, interest rate effective percentage rate maximum				1.50%
Senior Secured Revolving Credit Facility [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread				0.50%
Senior Secured Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment fee percentage				0.50%
Senior Secured Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment fee percentage				0.35%