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Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Feb. 28, 2016
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Summary Of Significant Accounting Policies [Line Items] |  |  |
Operating Lease, Liability | $ 55,238 | $ 54,300 | $ 54,300
Operating Lease, Right-of-Use Asset | $ 50,733 | $ 50,100 | $ 50,100

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- Definition Summary Of Significant Accounting Policies [Line Items] + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from 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 (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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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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