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Commitments and Contingencies - Total Rent Expense under Operating Lease (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Leased Assets [Line Items] |  |  |
Rent expense under operating leases | $ 17,239 | $ 15,123 | $ 11,580
Cost of Sales [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Rent expense under operating leases | 546 | 813 | 848
Administrative [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Rent expense under operating leases | $ 16,693 | $ 14,310 | $ 10,732

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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 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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- Details
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