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Components of Purchase Price Allocation (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Feb. 10, 2017 | Mar. 31, 2016
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Intangible Assets | $ 10,000 |  |
Goodwill | $ 198,370 |  | $ 133,885
Fairborn Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Inventories |  | $ 11,106 |
Property and Equipment |  | 314,897 |
Intangible Assets |  | 10,000 |
Other Assets |  | 4,000 |
Asset Retirement Obligation |  | (4,000) |
Total Net Assets |  | 336,003 |
Goodwill |  | 64,485 |
Total Estimated Purchase Price |  | $ 400,488 |

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