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Business Combinations - Additional Information (Detail) (USD $) | 6 Months Ended |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
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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 |  |  |  |  |

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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital + References No definition available. + Details
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- Definition Name of the acquired entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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