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Other Long-Term Obligations - Narrative (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Other Liabilities, Noncurrent [Abstract]    
Finance Lease, Liability, Noncurrent $ 21,376 $ 21,589
Deferred proceeds 4,189 4,511
Deferred compensation 4,005 2,585
Other 3,928 10,292
Other long-term obligations $ 33,498 $ 38,977