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Related Party Transaction - Schedule of Carrying Value of Finance Lease Obligations to Related Parties (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Schedule Of Related Party [Line Items] |  |  |
Finance Lease Obligations with subsidiary of The Modern Group, Ltd | $ 5,574 |  |
Less: Amounts due within one year | (5,089) | $ (3,879) | $ (3,007)
Total Finance Lease Obligations to Related Parties | 485 | 3,367 | $ 8,997
The Modern Group Ltd [member] |  |  |
Schedule Of Related Party [Line Items] |  |  |
Finance Lease Obligations with subsidiary of The Modern Group, Ltd | $ 5,574 | $ 7,246 |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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