Leases - Schedule of Future Minimum Lease Payments under Operating Leases Included in Lease Liabilities for Continuing and Discontinued Operations (Detail) - USD ($) $ in Thousands		Jun. 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		$ 13,390
Non-current lease liabilities		42,215
Continuing Operation [Member]
Lessee Lease Description [Line Items]
Operating Leases, remainder of 2019	[2]	7,431
Operating Leases, 2019	[1]		21,076
Operating Leases, 2020		16,462	17,728
Operating Leases, 2021		11,403	12,070
Operating Leases, 2022		8,652	8,638
Operating Leases, 2023 and thereafter		22,364	22,298
Operating Leases, Total		66,312	81,810
Less: imputed interest		10,707
Present value of future minimum lease payments		55,605
Less: current lease liabilities		13,390
Non-current lease liabilities		$ 42,215
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 June 30, 2019.