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Commitments and Contingencies - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Dec. 11, 2015 USD ($) | Dec. 31, 2017 USD ($) Property | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Expiration year of lease agreements |  | 2029 |  |
Rent and related expense |  | $ 16,800,000 | $ 16,600,000 | $ 17,400,000
Number of leased properties | Property |  | 1 |  |
Lease payments |  | $ 412,000 |  |
Lease agreement expiration year |  | 2020 |  |
Royalty license expiration year |  | 2023 |  |
Capital cost |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Remedial alternative, EPA preferred remedy | $ 7,300,000 |  |  |

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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