Goodwill and Intangible Assets - Summary of Goodwill and Intangible Assets Acquired (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 4,378	$ 4,401
Accumulated Amortization	(1,738)	(1,394)
Net Carrying Value	2,640	3,007
Lease Related Intangibles [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	3,598	3,621
Accumulated Amortization	(1,153)	(825)
Net Carrying Value	2,445	2,796
Non-Compete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	30	30
Accumulated Amortization	(20)	(16)
Net Carrying Value	10	14
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	750	750
Accumulated Amortization	(565)	(553)
Net Carrying Value	$ 185	$ 197