Leases - Summary of Future Maturities of Lease and Non-Lease Components (Detail) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Operating Leases [Abstract]
Operating Leases, Remainder of 2019		$ 7,824
Operating Leases, 2020		27,923
Operating Leases, 2021		23,131
Operating Leases, 2022		21,630
Operating Leases, 2023		19,324
Operating Leases, Thereafter		42,396
Operating Leases, Total lease liabilities		142,228
Operating Leases, Less: Amount representing interest		(17,547)
Operating Leases, Less: Short-term lease liabilities		(24,451)	$ 0
Operating Leases, Total long-term lease liabilities		100,230	$ 0
Finance Leases [Abstract]
Finance Leases, Remainder of 2019		58
Finance Leases, 2020		85
Finance Leases, 2021		40
Finance Leases, 2022		7
Finance Leases, 2023		0
Finance Leases, Thereafter		0
Finance Leases, Total lease liabilities		190
Finance Leases, Less: Amount representing interest		(6)
Finance Leases, Less: Short-term lease liabilities	[1]	(127)
Finance Leases, Total long-term lease liabilities	[2]	$ 57

[1] Current finance lease liabilities are included in Accrued expenses within the consolidated balance sheets.

[2] Long-term finance lease liabilities are included in Other liabilities within the consolidated balance sheets.