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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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 $ 11,700   $ 22,600  
Operating Lease, Income, Comprehensive Income [Extensible List] us-gaap:GeneralAndAdministrativeExpense   us-gaap:GeneralAndAdministrativeExpense  
Payments for operating lease liabilities     $ 21,800  
Short-term lease expense $ 700   1,300  
Sublease income $ 200   $ 400  
Operating lease, weighted average discount rate 7.49%   7.49%  
Operating lease, remaining weighted average lease term 9 years 1 month 6 days   9 years 1 month 6 days  
Operating lease ROU assets $ 192,498   $ 192,498  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent   us-gaap:OtherAssetsNoncurrent  
Operating lease ROU liabilities, current $ 22,816   $ 22,816  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndOtherAccruedLiabilitiesCurrent   us-gaap:AccountsPayableAndOtherAccruedLiabilitiesCurrent  
Operating lease ROU liabilities, non current $ 220,867   $ 220,867  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent   us-gaap:OtherLiabilitiesNoncurrent  
Rent expense, including operating lease costs $ 12,000 $ 10,500 $ 23,700 $ 20,700
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