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Leases - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Lessee Lease Description [Line Items] |  |  |  |  |
Operating lease, Percentage of office facilities | 96.00% |  |  |  |
Operating lease, option to extend | Our leases have remaining lease terms of 1 year to 11 years. These leases generally contain renewal options for periods ranging from two to five years. Because the Company is not reasonably certain to exercise these renewal options, the options are not considered in determining the lease term, and associated potential option payments are excluded from lease payments. |  |  |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] | true |  |  |  |
Operating lease expense |  |  | $ 38.0 | $ 38.4 | $ 37.0
Operating lease payments to related parties | $ 0.6 | $ 0.9 |  |  |
Minimum [Member] |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Operating lease, Remaining lease term | 1 year |  |  |  |
Operating lease, renewal term | 2 years |  |  |  |
Maximum [Member] |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Operating lease, Remaining lease term | 11 years |  |  |  |
Operating lease, renewal term | 5 years |  |  |  |

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- Definition Operating lease payments to related parties. + References No definition available. + Details
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- Definition Operating lease remaining lease term. + References No definition available. + Details
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- Definition Percentage of office facilities in operating lease. + 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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- Definition Indicates (true false) whether lessee has option to extend operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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