Assets and Liabilities Held for Sale - Summary of Assets and Liabilities of GPT Disposal Group Classified as Held for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total assets held for sale	$ 6,742	$ 69,699
Total liabilities held for sale	6,742	13,062
GPT
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash	1,422
Accounts receivable, net	2,238
Inventory, net	4,936
Prepaid expenses and other assets	215
Operating lease right-of-use assets	3,926
Property and equipment, net	7,356
Other intangible assets, net	1,033
Deferred income tax assets	4,371
Impairment loss	(18,910)	$ (2,190)
Total assets held for sale	6,587
Accounts payable	420
Accrued liabilities	2,238
Operating lease liabilities	3,929
Total liabilities held for sale	$ 6,587