Segments - Summary of Financial Information for the Company's Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 116,419	$ 87,007	$ 91,472	$ 83,343	$ 105,845	$ 68,817	$ 78,952	$ 76,923	$ 378,241	$ 330,537	$ 279,777
Total Segment EBITDA									148,535	103,985	92,619
Corporate And Other Non Segment [Member]
Segment Reporting Information [Line Items]
Total Segment EBITDA									(26,007)	(30,051)	(18,642)
Franchise [Member]
Segment Reporting Information [Line Items]
Revenue									116,488	88,085	71,806
Franchise [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Segment EBITDA									97,256	66,030	53,109
Franchise [Member] | US [Member]
Segment Reporting Information [Line Items]
Revenue									114,717	87,299	71,806
Franchise [Member] | International [Member]
Segment Reporting Information [Line Items]
Revenue									1,771	786
Corporate-owned Stores [Member]
Segment Reporting Information [Line Items]
Revenue									104,721	98,390	85,041
Corporate-owned Stores [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Segment EBITDA									40,847	36,070	31,705
Corporate-owned Stores [Member] | US [Member]
Segment Reporting Information [Line Items]
Revenue									100,541	95,459	85,022
Corporate-owned Stores [Member] | International [Member]
Segment Reporting Information [Line Items]
Revenue									4,180	2,931	19
Equipment [Member]
Segment Reporting Information [Line Items]
Revenue									157,032	144,062	122,930
Equipment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Segment EBITDA									36,439	31,936	26,447
Equipment [Member] | US [Member]
Segment Reporting Information [Line Items]
Revenue									$ 157,032	$ 144,062	$ 122,930