Leases - Schedule of Future Minimum Lease Payments under Operating Leases Included in Lease Liabilities for Continuing and Discontinued Operations (Detail) - USD ($) $ in Thousands		Mar. 31, 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		$ 14,595
Non-current lease liabilities		47,328
Continuing Operation [Member]
Lessee Lease Description [Line Items]
Operating Leases, remainder of 2019	[2]	15,549
Operating Leases, 2019	[1]		21,076
Operating Leases, 2020		17,605	17,728
Operating Leases, 2021		11,985	12,070
Operating Leases, 2022		8,652	8,638
Operating Leases, 2023 and thereafter		22,365	22,298
Operating Leases, Total		76,156	81,810
Less: imputed interest		14,233
Present value of future minimum lease payments		61,923
Less: current lease liabilities		14,595
Non-current lease liabilities		$ 47,328
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 April 2019 through December 2019.