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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