Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended	9 Months Ended
	Feb. 17, 2017	Jan. 06, 2017	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Depreciation and Other Amortization Expenses [Line Items]
Property and equipment impairment			$ 92	$ 203	$ 695
Cash received from property, plant and equipment				24	$ 17
Land, Buildings and Improvements | California
Depreciation and Other Amortization Expenses [Line Items]
Amount of divestiture of long-lived		$ 17,300
Cash received from property, plant and equipment	$ 17,300
Net cash received from property, plant and equipment		16,700
Payments for commissions and other fees		$ 600
Carrying value of the asset held for sale						$ 16,700
Construction in Progress
Depreciation and Other Amortization Expenses [Line Items]
Property and equipment impairment			$ 100	$ 200