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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Operating leases not yet commenced $ 1,600  
Operating leases not yet commenced term 5 years  
Lessee, Operating Lease, Renewal Term 5 years  
Finance lease right of use assets $ 2,960  
Finance lease liabilities 3,047  
Total lease payments 246,478  
2020 72,188  
2021 59,390  
2022 43,563  
2023 28,167  
Thereafter $ 23,617  
Non Cancelable Leases [Member]    
Total lease payments   $ 219,300
2019   70,400
2020   55,100
2021   41,300
2022   28,500
2023   15,700
Thereafter   $ 8,300
Maximum [Member]    
Operating Lease Remaining Lease Term 10 years  
Minimum [Member]    
Operating Lease Remaining Lease Term 1 year