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Commitments and Loss Contingency - Schedule of Future Minimum Purchases Remaining under Agreements (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2016 $ 41,806
2017 15,975
2018 1,718
2019 1,477
2020 857
2021 and thereafter 470
Total minimum payments required $ 62,303