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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Operating leases not yet commenced $ 14,000  
Lessee, Operating Lease, Renewal Term 5 years  
Finance lease right of use assets $ 2,783  
Finance lease liabilities 2,882  
Total rental commitments 198,595  
2019 49,782  
2020 54,414  
2021 41,900  
2022 28,251  
2023 15,745  
Thereafter $ 8,503  
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