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Leases - Schedule of Changes in Future Minimum Lease Obligations (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases [Abstract]      
Balance, Beginning of Period $ 36,814 $ 12,892 $ 7,094
Charges Incurred 14,838 32,351 20,552
Net Cash Payments (33,313) (16,413) (18,817)
Other 2,424 7,984 4,063
Balance, End of Period $ 20,763 $ 36,814 $ 12,892