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Commitment and Contingencies - Narratives (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2018 | Dec. 31, 2016 | Oct. 28, 2017 | Oct. 27, 2018 | Jan. 27, 2018
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, estimated loss |  |  |  |  | $ 13.0
Loss contingency accrual, payments |  | $ 0.1 |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  |  | $ 22.1 | 21.9
Letters of credit outstanding amount |  |  |  | 48.6 | 48.6
Standby Letters of Credit |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Letters of credit outstanding amount |  |  |  | 48.6 |
Goodman Networks, Inc. Wireline Operations |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Escrow deposit |  |  |  | 0.3 |
Funds released from escrow |  |  | $ 2.5 |  |
Performance Guarantee and Surety Bond [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Guarantor obligations, carrying value |  |  |  | 118.8 | 118.1
Indemnification Portion Subject to Certain Conditions, Not Less Than Twelve Months | Goodman Networks, Inc. Wireline Operations |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Escrow deposit |  |  |  | 22.5 |
Indemnification Portion Subject to Seller Satisfaction of Certain Liabilities | Goodman Networks, Inc. Wireline Operations |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Escrow deposit |  |  |  | $ 9.7 | $ 10.0
Proceeds from indemnification claims | $ 1.6 |  |  |  |

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