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Leases - Schedule of Changes in Future Minimum Lease Obligations (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Leases [Abstract]      
Balance, Beginning of Period $ 12,892 $ 7,094 $ 7,259
Charges Incurred 32,351 20,552 4,496
Net Cash Payments (16,413) (18,817) (5,475)
Other 7,984 4,063 814
Balance, End of Period $ 36,814 $ 12,892 $ 7,094