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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Finance lease, right-of-use asset | $ 659 |
Operating lease liabilities, current and long-term portions | $ 33,041 |
Accounting Standards Update 2016-02 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Finance lease, right-of-use asset |  | $ 35,939
Operating lease liabilities, current and long-term portions |  | $ 36,484

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- Definition Amount of lessee's right to use underlying asset under finance lease. + 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 (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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