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Intangible Assets by Major Class (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Gross Carrying Amount | $ 139,408 | $ 149,831
Intangible assets, Accumulated Amortization | 81,073 | 78,397
Intangible assets, Gross Carrying Amount | 145,008 | 155,431
Customer Relationships |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Gross Carrying Amount | 128,512 | 136,692
Intangible assets, Accumulated Amortization | 72,941 | 69,472
Non-Competition agreements |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Gross Carrying Amount | 7,263 | 9,167
Intangible assets, Accumulated Amortization | 7,052 | 8,275
Software |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Gross Carrying Amount | 3,273 | 3,594
Intangible assets, Accumulated Amortization | $ 940 | 613
Minimum |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Useful Life in Years | 1 year |
Minimum | Customer Relationships |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Useful Life in Years | 1 year |
Minimum | Non-Competition agreements |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Useful Life in Years | 1 year |
Minimum | Software |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Useful Life in Years | 3 years |
Maximum |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Useful Life in Years | 15 years |
Maximum | Customer Relationships |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Useful Life in Years | 15 years |
Maximum | Non-Competition agreements |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Useful Life in Years | 10 years |
Maximum | Software |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Useful Life in Years | 10 years |
Trade Names |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Gross Carrying Amount | $ 360 | 378
Intangible assets, Accumulated Amortization | $ 140 | 37
Indefinite-lived intangible assets, Useful Life | Indefinite |
Indefinite-lived intangible assets, Gross Carrying Amount | $ 5,600 | $ 5,600
Trade Names | Minimum |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Useful Life in Years | 1 year |
Trade Names | Maximum |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Useful Life in Years | 2 years |

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