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Leases - Additional Information (Detail)
$ in Thousands
 1 Months Ended 12 Months Ended
Aug. 31, 2019
ft²
RenewalOption
Jun. 30, 2017
Dec. 31, 2007
USD ($)
Building
Dec. 31, 2019
USD ($)
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            
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 ten years each. We were not reasonably certain to exercise either of these options at lease commencement.            
Restricted cash       $ 3,206 $ 5,477    
Operating lease cost       8,100      
Cash paid for cashflows from operating lease       7,700      
Operating lease right of use asset       74,364      
Operating lease, liability       $ 95,038      
Operating lease, weighted average remaining lease term       11 years 2 months 12 days      
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       $ 200   $ 1,000