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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Operating leases not yet commenced $ 17,000  
Lessee, Operating Lease, Renewal Term 5 years  
Finance lease right of use assets $ 2,759  
Finance lease liabilities 2,852  
Total rental commitments 206,175  
2020 60,667  
2021 47,995  
2022 33,232  
2023 19,039  
Thereafter $ 9,921  
Non Cancelable Leases [Member]    
Total rental commitments   $ 219,300
2019   70,400
2020   55,100
2021   41,300
2022   28,500
2023   15,700
Thereafter   $ 8,300
Maximum [Member]    
Operating leases not yet commenced term 11 years  
Operating Lease Remaining Lease Term 9 years  
Minimum [Member]    
Operating leases not yet commenced term 5 years  
Operating Lease Remaining Lease Term 1 year