Goodwill - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Line Items]
Establishment of goodwill	This goodwill was established in connection with the acquisitions of Correctional Management, Inc. ("CMI") in the second quarter of 2016 and Avalon Correctional Services, Inc. ("Avalon") in the fourth quarter of 2015, both as further described in Note 5, the acquisition of Correctional Alternatives, Inc. ("CAI") during 2013, and the acquisitions of two service companies during 2000.
Goodwill	$ 38,386	$ 35,557