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Investment in Unconsolidated Entity - Additional Information (Detail) $ in Thousands |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 05, 2018 USD ($) | Apr. 22, 2019 USD ($) | Jun. 21, 2017 USD ($) Location board-member | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 | Jun. 29, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment in unconsolidated entity |  |  |  | $ 4,940 | $ 3,760 |  |
Proceeds from non-controlling interest for investment in unconsolidated entity |  |  |  | $ 988 | $ 752 |  |
Carrier Enterprise I |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage by parent |  |  | 80.00% |  |  |  |
Ownership percentage, by non-controlling owners |  |  | 20.00% |  |  |  |
Russell Sigler Inc |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership interest acquired |  | 38.10% | 34.90% |  |  | 36.30% |
Investment in unconsolidated entity | $ 3,760 | $ 4,940 | $ 63,600 |  |  |  |
Contribution to investment in unconsolidated entity by controlling interest | 3,008 | 3,952 | 50,880 |  |  |  |
Proceeds from non-controlling interest for investment in unconsolidated entity | $ 752 | $ 988 | $ 12,720 |  |  |  |
Ownership percentage needed for right to purchase up to 100% |  |  | 85.00% |  |  |  |
Total number of board members | board-member |  |  | 6 |  |  |  |
Number of board members that can be appointed based on ownership | board-member |  |  | 2 |  |  |  |
Equity method investment, additional ownership interest acquired |  | 1.80% |  |  |  |  | 1.40%
Russell Sigler Inc | Western United States |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of locations | Location |  |  | 30 |  |  |  |

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