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Commitments - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commitments Disclosure [Line Items] |  |  |
Rent expense | $ 89,377 | $ 68,920 | $ 62,294
Short term committed purchase obligations | 49,912 |  |
Contribution by employer for employee saving plan | $ 19,600 | $ 18,210 | $ 9,681
Buildings |  |  |
Commitments Disclosure [Line Items] |  |  |
Terms of operating leases expiring year | Dec. 31, 2032 |  |
Land |  |  |
Commitments Disclosure [Line Items] |  |  |
Terms of operating leases expiring year | Dec. 31, 2057 |  |

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- Definition Commitments and Contingencies Disclosure [Line Items] + References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + 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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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 + Details
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- Details
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- Details
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