Leases - Schedule of Future Minimum Lease Payments under Operating Leases Included in Lease Liabilities for Continuing and Discontinued Operations (Detail) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Lessee Lease Description [Line Items]
Operating Leases, 2019	[1]		$ 21,884
Operating Leases, 2020			17,728
Operating Leases, 2021			12,070
Operating Leases, 2022			8,638
Operating Leases, 2023 and thereafter			22,298
Operating Leases, Total			82,618
Less: current lease liabilities		$ 12,109
Non-current lease liabilities		54,904
Continuing Operation [Member]
Lessee Lease Description [Line Items]
Operating Leases, remainder of 2019	[2]	2,451
Operating Leases, 2019	[1]		21,076
Operating Leases, 2020		17,390	17,728
Operating Leases, 2021		13,505	12,070
Operating Leases, 2022		11,331	8,638
Operating Leases, 2023 and thereafter		35,821	22,298
Operating Leases, Total		80,498	81,810
Less: imputed interest		13,485
Present value of future minimum lease payments		67,013
Less: current lease liabilities		12,109
Non-current lease liabilities		$ 54,904
Discontinued Operations [Member]
Lessee Lease Description [Line Items]
Operating Leases, 2019	[1]		808
Operating Leases, Total			$ 808

[1] Amounts include payments due associated with executed early terminations of real estate leases and represent payments for the full year 2019.

[2] Amounts provided are for liabilities remaining as of September 30, 2019.