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Contingent Liabilities - Additional Information (Detail) | Aug. 27, 2015 plaintiff | Dec. 31, 2016 USD ($)
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Loss Contingencies [Line Items] |  |
Loss Contingency, Number of Plaintiffs | plaintiff | 8 |
Minimum [Member] |  |
Loss Contingencies [Line Items] |  |
Range of reasonably possible losses |  | $ 0
Maximum [Member] |  |
Loss Contingencies [Line Items] |  |
Range of reasonably possible losses |  | $ 7,000,000

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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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