Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Summary of Future Minimum Lease Commitments (Detail)

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Commitments and Contingencies - Summary of Future Minimum Lease Commitments (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]  
Financing lease obligations, Total $ 30,042
Financing lease obligations, 1 year 1,054
Financing lease obligations, 2 years 1,336
Financing lease obligations, 3 years 1,336
Financing lease obligations, 4 years 1,336
Financing lease obligations, 5 years 1,336
Financing lease obligations, After 5 years 23,644
Operating lease obligations, Total 80
Operating lease obligations, 1 year 76
Operating lease obligations, 2 years 1
Operating lease obligations, 3 years 1
Operating lease obligations, 4 years 1
Operating lease obligations, 5 years 1
Operating lease obligations, After 5 years 0
Total contractual obligations 30,122
Total contractual obligations, 1 year 1,130
Total contractual obligations, 2 years 1,337
Total contractual obligations, 3 years 1,337
Total contractual obligations, 4 years 1,337
Total contractual obligations, 5 years 1,337
Total contractual obligations, After 5 years $ 23,644