Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | |
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Dec. 31, 2018 |
Dec. 31, 2017 |
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| Commitment And Contingencies [Line Items] | ||
| Rental expense included in operating expenses | $ 20.2 | $ 20.3 |
| Minimum [Member] | ||
| Commitment And Contingencies [Line Items] | ||
| Operating lease expiration period | 10 years | |
| Operating lease renewal period | 1 year | |
| Maximum [Member] | ||
| Commitment And Contingencies [Line Items] | ||
| Operating lease expiration period | 25 years | |
| Operating lease renewal period | 5 years | |
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- Definition Commitment And Contingencies [Line Items] No definition available.
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- Definition Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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