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Leases - Schedule of Changes in Future Minimum Lease Obligations (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]      
Balance, Beginning of Period $ 20,763 $ 36,814 $ 12,892
Charges Incurred 10,955 14,838 32,351
Net Cash Payments (20,659) (33,313) (16,413)
Other 41 2,424 7,984
Balance, End of Period $ 11,100 $ 20,763 $ 36,814