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Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Other Intangible Assets [Line Items] |  |
Finite-lived intangible assets, Gross Amount | $ 145,423 |
Finite-lived intangible assets, Accumulated Amortization | (10,635) |
Finite-lived intangible assets, Net Carrying Value | 134,788 |
Customer Relationships [Member] |  |
Other Intangible Assets [Line Items] |  |
Finite-lived intangible assets, Gross Amount | 144,123 | $ 71,581
Finite-lived intangible assets, Accumulated Amortization | (10,563) | (6,834)
Finite-lived intangible assets, Net Carrying Value | $ 133,560 | $ 64,747
Customer Relationships [Member] | Minimum [Member] |  |
Other Intangible Assets [Line Items] |  |
Intangible assets estimated useful life | 5 years | 7 years
Customer Relationships [Member] | Maximum [Member] |  |
Other Intangible Assets [Line Items] |  |
Intangible assets estimated useful life | 15 years | 15 years
Trade Name [Member] |  |
Other Intangible Assets [Line Items] |  |
Finite-lived intangible assets, Gross Amount | $ 1,300 |
Finite-lived intangible assets, Accumulated Amortization | (72) |
Finite-lived intangible assets, Net Carrying Value | $ 1,228 |
Intangible assets estimated useful life | 18 months |

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