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Supplemental Cash Flow Information Related To Leases (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows for operating leases $ 4,295 $ 7,975
Total 4,295 7,975
Right-of-use assets obtained in exchange for new lease obligations:    
Operating leases 20,991 115,488
Total $ 20,991 $ 115,488