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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 23, 2015 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commitments And Contingencies [Line Items] |  |  |  |  |
Total operating lease expense |  |  | $ 24.6 | $ 24.1 | $ 25.3
Loss Contingency, name of plaintiff |  | Baldwin Hackett & Meeks, Inc. |  |  |
Loss contingency, damages sought, value | $ 43.8 |  |  |  |
Loss contingency, damages awarded, value |  | $ 43.8 |  |  |
BHMI judgment and related fees |  |  |  | 48.1 |
Litigation settlement |  |  |  | 2.7 |
General and Administrative Expense [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
BHMI judgment and related fees |  |  |  | $ 46.7 |
Interest Expense [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
BHMI judgment and related fees |  |  | $ 1.4 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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