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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Leased Assets [Line Items] |  |  |
Rent expense under operating leases | $ 15,123 | $ 11,580 | $ 9,362
Cost of Sales [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Rent expense under operating leases | 813 | 848 | 855
Administrative [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Rent expense under operating leases | $ 14,310 | $ 10,732 | $ 8,507

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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://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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