Goodwill and Intangible Assets - Summary of Finite Lived Intangible Assets Acquired (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 4,401	$ 4,401
Accumulated Amortization	(1,639)	(1,394)
Net Carrying Value	2,762	3,007
Lease Related Intangibles [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	3,621	3,621
Accumulated Amortization	(1,060)	(825)
Net Carrying Value	2,561	2,796
Non-Compete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	30	30
Accumulated Amortization	(18)	(16)
Net Carrying Value	12	14
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	750	750
Accumulated Amortization	(561)	(553)
Net Carrying Value	$ 189	$ 197