Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Lessee Lease Description [Line Items]
Operating lease option to extend description			options to extend the leases in 5 to 10 year increments for up to 10 years.
Operating lease cost	$ 12,100		$ 34,700
Operating Lease, Income, Comprehensive Income [Extensible List]	us-gaap:GeneralAndAdministrativeExpense		us-gaap:GeneralAndAdministrativeExpense
Payments for operating lease liabilities			$ 32,900
Short-term lease expense	$ 700		2,000
Sublease income	$ 200		$ 600
Operating lease, weighted-average discount rate	7.47%		7.47%
Operating lease, remaining weighted-average lease term	9 years		9 years
Operating lease ROU assets	$ 202,031		$ 202,031
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent		us-gaap:OtherAssetsNoncurrent
Operating lease ROU liabilities, current	$ 25,442		$ 25,442
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndOtherAccruedLiabilitiesCurrent		us-gaap:AccountsPayableAndOtherAccruedLiabilitiesCurrent
Operating lease ROU liabilities, non current	$ 228,620		$ 228,620
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent		us-gaap:OtherLiabilitiesNoncurrent
Rent expense, including operating lease costs	$ 13,000	$ 10,900	$ 36,700	$ 31,600
Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease remaining term	1 year		1 year
Options to extend the lease	5 years		5 years
Maximum [Member]
Lessee Lease Description [Line Items]
Operating lease remaining term	13 years		13 years
Options to extend the lease	10 years		10 years