Business Combination Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Apr. 08, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 38,386		$ 35,557
Avalon Correctional Services, Inc
Business Acquisition [Line Items]
Property and equipment			119,200
Intangible assets			18,500
Total identifiable assets			137,700
Goodwill			19,800
Total consideration			$ 157,500
Correctional Management, Inc
Business Acquisition [Line Items]
Tangible current assets and liabilities, net		$ 1,000
Property and equipment		29,200
Intangible assets		1,500
Total identifiable assets		31,700
Goodwill		3,300
Total consideration		$ 35,000