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Leases - Additional Information (Detail)
$ in Thousands
 1 Months Ended 9 Months Ended
Aug. 31, 2019
USD ($)
ft²
RenewalOption
Dec. 31, 2007
USD ($)
Building
Sep. 30, 2019
USD ($)
Building
Dec. 31, 2018
USD ($)
May 31, 2018
USD ($)
ft²
Dec. 31, 2008
USD ($)
Leases [Line Items]            
Sale of facility and associated real property   $ 109,000        
Mortgage debt retired   47,700        
Cash received net of transaction costs and debt retirement   $ 61,000        
Net deferred gain on real estate sale       $ 8,000   $ 39,100
Lease back transaction lease period   12 years        
Number of building leased | Building   2 1      
Number of vacated buildings | Building   1        
Lessee operating lease term of contract 12 years          
Restricted cash     $ 4,706 $ 5,477    
Number of times to renew the lease contract | RenewalOption 2          
Lease extension period 10 years          
Lease description The 2019 amendment includes two options to extend the term of the lease for a period of 10 years each. We were not reasonably certain to exercise either of these options at lease commencement.          
Deposits     700      
Operating lease cost     5,900      
Cash paid for cashflows from operating lease     5,500      
Operating lease right of use asset     61,987      
Operating lease, liability     $ 82,641      
Operating lease, weighted average remaining lease term     11 years 5 months 4 days      
Operating lease, weighted average discount rate, percent     5.84%      
Letter of Credit            
Leases [Line Items]            
Restricted cash $ 3,000          
Amended Lease Term            
Leases [Line Items]            
Lease expiration date Jul. 31, 2031 Dec. 31, 2029        
Office space area leased | ft² 80,282          
Lease Agreement            
Leases [Line Items]            
Office space area leased | ft²         44,718  
Lessee operating lease term of contract         10 years 10 months  
Tenant improvement allowances         $ 4,200  
Lease Agreement | Letter of Credit            
Leases [Line Items]            
Restricted cash         $ 1,000