Segment Reporting - Revenues and Income from Operations for Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues
Total revenues	$ 226,900	$ 216,818	$ 416,504	$ 397,514
Segment income (loss) from operations
Total income from operations	20,025	17,216	22,976	14,266
United States, Excluding All Points [Member]
Revenues
Total revenues	179,864	167,821	335,225	311,942
Segment income (loss) from operations
Total income from operations	17,544	15,679	20,435	12,956
All Points [Member]
Revenues
Total revenues	5,228	5,628	9,450	10,741
Segment income (loss) from operations
Total income from operations	569	481	924	815
Canada [Member]
Revenues
Total revenues	40,166	41,133	68,299	70,549
Segment income (loss) from operations
Total income from operations	2,503	1,062	1,763	791
Mexico [Member]
Revenues
Total revenues	1,514	1,844	3,225	3,555
Segment income (loss) from operations
Total income from operations	(390)	127	(187)	263
Australia [Member]
Revenues
Total revenues	128	392	305	727
Segment income (loss) from operations
Total income from operations	$ (201)	$ (133)	$ 41	$ (559)