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Business Combinations - Additional Information (Detail) (USD $)
 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Sep. 30, 2013
Mar. 31, 2014
Griffith Energy Services, Inc.
Mar. 04, 2014
Griffith Energy Services, Inc.
Customer
Mar. 31, 2014
Griffith Energy Services, Inc.
Mar. 31, 2014
Griffith Energy Services, Inc.
Mar. 31, 2014
Griffith Energy Services, Inc.
Minimum
Mar. 31, 2014
Griffith Energy Services, Inc.
Maximum
Business Acquisition [Line Items]                  
Name of acquired entity         Griffith Energy Services, Inc.        
Percentage of voting equity interests acquired         100.00%        
Total Cash paid to acquire business $ 97,950,000       $ 98,700,000        
Cash paid to acquire business         69,900,000        
Working capital acquired, net of cash         28,800,000        
Cash acquired 4,151,000 0     4,200,000        
Letters of credit issued 55,000,000   44,700,000   8,500,000        
Number of customers acquired from Griffith         50,000        
Total costs related to the acquisition           800,000 800,000    
Goodwill 204,268,000   201,130,000 3,138,000   3,138,000 3,138,000    
Customer lists, other intangibles and trade names amortization period               10 years 20 years
Sales of acquired entity since acquisition date       29,600,000          
Net earnings of acquired entity since acquisition date       $ 1,600,000