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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Commitments and Contingencies Disclosure [Line Items] |  |
Liability for deferred lease expenses | $ 40,929 | $ 42,378
Employer matching contribution payments | 6,380 | $ 3,187
Liability recorded for employer contribution payments | $ 999 |
Tim Warner |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Employment agreement termination date | Apr. 01, 2016 |
Other Employees Except Tim Warner |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Employment agreements term extension | 1 year |
Minimum |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Operating and capital leases with terms generally ranging | 10 years |
Maximum |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Operating and capital leases with terms generally ranging | 25 years |

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- Definition For a classified balance sheet, the cumulative difference between the rental income or payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, more than one year after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.26(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39927-112707 + Details
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