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Acquisitions - Additional Information (Detail) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) Market shares
2019 Acquisitions [Member] |  |
Business Acquisition [Line Items] |  |
Net cash purchase price of outdoor advertising assets | $ 214,559 |
Total purchase price of outdoor advertising assets | 215,869 |
Total acquired intangible assets | 179,228 |
Portion of acquired intangible assets assigned to goodwill | 20,088 |
Goodwill amount deductible for tax purposes | $ 18,206 |
Weighted average useful life | 14 years |
Aggregate amortization expense related to acquisition | $ 4,365 |
2019 Acquisitions [Member] | Customer Lists and Contracts [Member] |  |
Business Acquisition [Line Items] |  |
Total acquired intangible assets | $ 22,575 |
Weighted average useful life | 7 years |
2019 Acquisitions [Member] | Site Locations [Member] |  |
Business Acquisition [Line Items] |  |
Total acquired intangible assets | $ 135,658 |
Weighted average useful life | 15 years |
Fairway Outdoor Advertising [Member] |  |
Business Acquisition [Line Items] |  |
Total purchase price of outdoor advertising assets |  | $ 418,500
Post-closing adjustments to acquired working capital related to purchase | $ 1,310 |
Portion of acquired intangible assets assigned to goodwill | 145,258 |
Number of business acquired | Market |  | 5
Portion of acquired assets assigned to property, plant and equipment | 99,386 |
Portion of acquired assets assigned to intangibles | 186,130 |
Adjustment to the preliminary allocation of Goodwill | 36,859 |
Write off of deferred tax liabilities | 17,031 |
July 15, 2019 Acquisitions [Member] |  |
Business Acquisition [Line Items] |  |
Total purchase price of outdoor advertising assets | $ 127,000 |
2018 Acquisitions [Member] |  |
Business Acquisition [Line Items] |  |
Total purchase price of outdoor advertising assets |  | $ 489,671
Total acquired intangible assets |  | 402,740
Portion of acquired intangible assets assigned to goodwill |  | 182,117
Goodwill amount deductible for tax purposes |  | $ 0
Weighted average useful life |  | 14 years
Aggregate amortization expense related to acquisition |  | $ 2,681
Cash acquired in acquisitions |  | 8,554
Total purchase price consisting of cash |  | 477,389
Total acquired intangible assets |  | $ 220,623
2018 Acquisitions [Member] | Common Class A [Member] |  |
Business Acquisition [Line Items] |  |
Issuance of common stock | shares |  | 163,137
Issuance of common stock, value |  | $ 12,282
2018 Acquisitions [Member] | Customer Lists and Contracts [Member] |  |
Business Acquisition [Line Items] |  |
Total acquired intangible assets |  | $ 33,310
Weighted average useful life |  | 7 years
2018 Acquisitions [Member] | Site Locations [Member] |  |
Business Acquisition [Line Items] |  |
Total acquired intangible assets |  | $ 186,635
Weighted average useful life |  | 15 years

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