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Leases Supplemental Cash Flow Information Related Leases (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating Cash Flows from Operating Leases $ 24,283 $ 46,415
Right-of-Use Assets Obtained in Exchange for New Operating Lease, Liabilities $ 6,995 $ 7,383