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Goodwill and Other Intangibles - Intangible Assets Subject to Amortization (Detail) $ in Thousands | Sep. 30, 2018 USD ($)
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Finite Lived Intangible Assets [Line Items] |
Gross Amount | $ 559,870
Accumulated Amortization | (80,981)
Net Balance | 478,889
Noncompetition agreements |
Finite Lived Intangible Assets [Line Items] |
Gross Amount | 12,024
Accumulated Amortization | (11,105)
Net Balance | 919
Customer Relationships |
Finite Lived Intangible Assets [Line Items] |
Gross Amount | 56,530
Accumulated Amortization | (18,325)
Net Balance | 38,205
Operating Permits |
Finite Lived Intangible Assets [Line Items] |
Gross Amount | 458,952
Accumulated Amortization | (31,375)
Net Balance | 427,577
Use Rights And Other |
Finite Lived Intangible Assets [Line Items] |
Gross Amount | 19,564
Accumulated Amortization | (10,789)
Net Balance | 8,775
Trade names |
Finite Lived Intangible Assets [Line Items] |
Gross Amount | 12,800
Accumulated Amortization | (9,387)
Net Balance | $ 3,413

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