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Goodwill and Other Intangibles - Intangible Assets Subject to Amortization (Detail) $ in Thousands | Jun. 30, 2018 USD ($)
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Finite Lived Intangible Assets [Line Items] |
Gross Amount | $ 559,870
Accumulated Amortization | (75,271)
Net Balance | 484,599
Noncompetition agreements |
Finite Lived Intangible Assets [Line Items] |
Gross Amount | 6,274
Accumulated Amortization | (6,162)
Net Balance | 112
Customer Relationships |
Finite Lived Intangible Assets [Line Items] |
Gross Amount | 65,348
Accumulated Amortization | (19,480)
Net Balance | 45,868
Operating Permits |
Finite Lived Intangible Assets [Line Items] |
Gross Amount | 458,952
Accumulated Amortization | (29,790)
Net Balance | 429,162
Use Rights And Other |
Finite Lived Intangible Assets [Line Items] |
Gross Amount | 16,496
Accumulated Amortization | (10,763)
Net Balance | 5,733
Trade names |
Finite Lived Intangible Assets [Line Items] |
Gross Amount | 12,800
Accumulated Amortization | (9,076)
Net Balance | $ 3,724

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