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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Derivative Instruments Liabilities [Member] - Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Liabilities [Abstract]
Total Liabilities	$ 6,883	$ 560	$ 18,751
Level 3 [Member]
Liabilities [Abstract]
Total Liabilities	$ 6,883	$ 560	$ 18,751

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- References

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