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Leases, User Charges and Commitments - Future Payments Due (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Leases [Abstract]  
Future Payments Due, Capital Lease, 2016 $ 3,182
Future Payments Due, Capital Lease, 2017 3,173
Future Payments Due, Capital Lease, 2018 3,173
Future Payments Due, Capital Lease, 2019 3,173
Future Payments Due, Capital Lease, 2020 3,182
Future Payments Due, Capital Lease, 2021 and thereafter 1,845
Future Payments Due, Capital Lease, Total 17,728
Less: Imputed interest (1,821)
Net capital lease liability 15,907
Future Payments Due, Operating Leases and Other Commitments, 2016 8,883
Future Payments Due, Operating Leases and Other Commitments, 2017 4,992
Future Payments Due, Operating Leases and Other Commitments, 2018 2,841
Future Payments Due, Operating Leases and Other Commitments, 2019 1,455
Future Payments Due, Operating Leases and Other Commitments, 2020 1,405
Future Payments Due, Operating Leases and Other Commitments, 2021 and thereafter 5,003
Future Payments Due, Operating Leases and Other Commitments, Total 24,579
Future Payments Due, Total Leases, 2016 12,065
Future Payments Due, Total Leases, 2017 8,165
Future Payments Due, Total Leases, 2018 6,014
Future Payments Due, Total Leases, 2019 4,628
Future Payments Due, Total Leases, 2020 4,587
Future Payments Due, Total Leases, 2021 and thereafter 6,848
Future Payments Due, Leases, Total $ 42,307