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Organization - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended	0 Months Ended
	Feb. 10, 2014	Dec. 31, 2014 Segment	Feb. 19, 2014	Jun. 17, 2014	Dec. 31, 2013
Basis Of Presentation And Organization [Line Items]
Number of operating segment		1us-gaap_NumberOfOperatingSegments
Stock split description	19.5-for-one
Stock split ratio	19.5
Common stock, shares issued		31,839,087us-gaap_CommonStockSharesIssued			16,183,901us-gaap_CommonStockSharesIssued
Common stock, shares outstanding		31,539,087us-gaap_CommonStockSharesOutstanding			16,183,901us-gaap_CommonStockSharesOutstanding
Proceeds from issuance of IPO		$ 87,645
Payment to redeem redeemable preferred stock		75,735
Proceeds from secondary public offering of common stock, net of costs		14,418
IPO [Member]
Basis Of Presentation And Organization [Line Items]
Common stock, shares issued			8,567,500
Proceeds from issuance of IPO			94,242
Payment to redeem redeemable preferred stock			75,735
Proceeds from IPO used to pay underwriting fees			6,597
Common stock, price per share			$ 11.00
IPO [Member] \| Revolving Credit Facility [Member]
Basis Of Presentation And Organization [Line Items]
Payment of revolving credit facility			11,910
Secondary Public Offering [Member]
Basis Of Presentation And Organization [Line Items]
Secondary Public Offering, Shares				9,314,196
Secondary Public Offering, Share Price				$ 12.50
Proceeds from secondary public offering of common stock, net of costs				$ 14,418
Secondary Public Offering [Member] \| Selling Stockholder [Member]
Basis Of Presentation And Organization [Line Items]
Secondary Public Offering, Shares				8,100,000
Secondary Public Offering [Member] \| Underwriters Option To Purchase Additional Shares [Member]
Basis Of Presentation And Organization [Line Items]
Secondary Public Offering, Shares				1,214,196
Shares Prior to Stock Split [Member]
Basis Of Presentation And Organization [Line Items]
Common stock, shares issued	1,129,944
Common stock, shares outstanding	1,129,944
Stock Split [Member]
Basis Of Presentation And Organization [Line Items]
Common stock, shares issued	22,033,901
Common stock, shares outstanding	22,033,901
UNITED STATES
Basis Of Presentation And Organization [Line Items]
Number of locations the company operates		100