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Leases - Narrative (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Operating Lease, Weighted Average Remaining Lease Term 7 years 2 months 7 years 2 months  
Finance Lease, Weighted Average Remaining Lease Term 11 years 11 years  
Operating Lease, Right-of-Use Asset $ 75,338 $ 75,338 $ 0
Operating Lease, Payments   8,074  
Finance Lease, Interest Payment on Liability 467 939  
Operating Lease, Cost 3,529 7,009  
Finance Lease, Right-of-Use Asset, Amortization 463 878  
Finance Lease, Cost 930 1,817  
Variable Lease, Cost 337 556  
Lease, Cost 4,796 9,382  
Finance Lease, Principal Payments   592  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability   937  
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability   493  
Finance Lease, Right-of-Use Asset 16,740 16,740  
total leased assets 92,078 92,078  
Operating Lease, Liability, Current 12,396 12,396  
Finance Lease, Liability, Current 1,381 1,381  
Total lease liability, current 13,777 13,777 0
Operating Lease, Liability, Noncurrent 70,194 70,194 0
Finance Lease, Liability, Noncurrent 21,376 21,376 $ 21,589
Total lease liability, noncurrent 91,570 91,570  
Total lease liabilities $ 105,347 $ 105,347  
Operating Lease, Weighted Average Discount Rate, Percent 4.90% 4.90%  
Finance Lease, Weighted Average Discount Rate, Percent 8.30% 8.30%  
Minimum [Member]      
Remaining lease term   1 year  
Maximum [Member]      
Remaining lease term   12 years