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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Commitments [Line Items] |  |  |
Liability for deferred rent | $ 1.3 | $ 1.1 |
Operating lease rent expense | $ 6.1 | $ 5.6 | $ 4.4
Minimum [Member] |  |  |
Other Commitments [Line Items] |  |  |
Operating lease expiration year | 2018 |  |
Maximum [Member] |  |  |
Other Commitments [Line Items] |  |  |
Operating lease expiration year | 2024 |  |

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- Definition Operating lease expiration year. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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Balance Type: |
Period Type: |