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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jan. 31, 2018 | Sep. 30, 2018 USD ($) ft² | Dec. 31, 2017 USD ($)
Commitments and Contingencies [Line Items] |  |  |
Transition tax |  |  | $ 40.3
Measurement period adjustment to reduce transition tax |  | $ 3.1 |
Other Long-term Liabilities |  |  |
Commitments and Contingencies [Line Items] |  |  |
Transition tax |  | $ 28.9 | 36.8
Northern Virginia Office Space |  |  |
Commitments and Contingencies [Line Items] |  |  |
Office space area leased under the agreement | ft² |  | 214,000 |
Lease expiration date | 2030-12 |  |
Northern Virginia Office Space | Other Long-term Liabilities |  |  |
Commitments and Contingencies [Line Items] |  |  |
Deferred rent included in other long-term liabilities |  | $ 27.1 | $ 8.5

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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