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Summary of Significant Accounting Policies - Summary of Other Current Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule Of Other Current Assets [Line Items] |  |
Other Current Assets | $ 1,824 | $ 1,993
Pipe and oil field equipment inventory |  |
Schedule Of Other Current Assets [Line Items] |  |
Other Current Assets | 1,183 | 1,198
Other |  |
Schedule Of Other Current Assets [Line Items] |  |
Other Current Assets | $ 641 | $ 795

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- Definition Amount of current assets classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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