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Summary Of Balance Sheet Information Related To Operating Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
ROU assets	$ 209,169	$ 223,369
Current portion of operating lease liabilities	70,232	68,199
Operating lease liabilities	139,527	154,271
Total operating lease liabilities	$ 209,759	$ 222,470
Weighted Average Remaining Lease Term (in years)
Operating leases	3 years 6 months	3 years 10 months 24 days
Weighted Average Discount Rate
Operating leases	4.00%	4.48%

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Amount of lessee's right to use underlying asset under operating lease.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Operating ​lease​ liabilities.

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Operating ​lease ​liabilities ​noncurrent.

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