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Summary of Final Fair Values and Purchase Price Allocation at Acquisition Date of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Mar. 04, 2014
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Property and equipment |  | $ 2,500 | $ 17,600 |
Goodwill | $ 212,760 | $ 211,045 | $ 209,331 |
Griffith Energy Services, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Trade accounts receivable |  |  |  | $ 49,010
Inventories |  |  |  | 5,143
Other current assets |  |  |  | 2,984
Property and equipment |  |  |  | 17,263
Other long term assets |  |  |  | 1,778
Current liabilities |  |  |  | (31,096)
Total net identifiable assets acquired |  |  |  | 89,482
Total consideration |  |  |  | 97,650
Less: Total net identifiable assets acquired |  |  |  | 89,482
Goodwill |  |  |  | 8,168
Griffith Energy Services, Inc. | Customer lists, trade names and other intangibles |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  |  |  | $ 44,400

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