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Investment in Unconsolidated Affiliate - Additional Information (Detail) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 21, 2017 USD ($) board_member Location | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Investment in unconsolidated entity |  | $ 63,600 |
Proceeds from non-controlling interest for investment in unconsolidated entity |  | $ 12,720 |
Carrier Enterprise I |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest acquired | 35.00% |  |
Ownership percentage by parent | 80.00% |  |
Ownership percentage, by non-controlling owners | 20.00% |  |
Investment in unconsolidated entity | $ 63,600 |  |
Contribution to investment in unconsolidated entity by controlling interest | 50,880 |  |
Proceeds from non-controlling interest for investment in unconsolidated entity | $ 12,720 |  |
Russell Sigler Inc | Western United States [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of locations | Location | 30 |  |
Russell Sigler sales |  |  | $ 650,000
Russell Sigler Inc | Carrier Enterprise I |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
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 |  |

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