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Recently Adopted Accounting Standards - Additional Information (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Feb. 29, 2016
--- | --- | --- | ---
Operating lease assets | $ 44,251 | $ 0 |
Operating lease liabilities | $ 6,859 | $ 0 |
Accounting Standards Update 2016-02 [Member] |  |  |
Operating lease assets |  |  | $ 45,800
Operating lease liabilities |  |  | $ 47,200

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under operating 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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