Segment Disclosures - Schedule of Revenue from External Customers (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
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 178,785	$ 199,794	$ 197,015	$ 224,238	$ 164,412	$ 187,102	$ 185,042	$ 213,866	$ 799,832	$ 750,422	$ 719,483
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									798,420	748,971	717,865
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									$ 1,412	$ 1,451	$ 1,618