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Schedule of Intangible Assets, Including Impact of Impairment Charge (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2015 | Mar. 31, 2015
Finite Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Amortization |  | $ 8,314 | $ 5,700
Intangible Assets, Impairment | $ 28,354 | 28,354 |
Intangible Assets, Accumulated Amortization | (50,016) | (50,016) | (13,348)
Goodwill, Cost | 133,885 | 133,885 | 132,515
Goodwill, Net | 133,885 | 133,885 | 132,515
Total Goodwill and Intangible Assets, Cost | 227,085 | 227,085 | 224,515
Total Goodwill and Intangible Assets, Impairment |  | 28,354 |
Total Goodwill and Intangible Assets, Net | 177,069 | 177,069 | 211,167
Customer Contracts And Relationships [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Cost | 63,260 | 63,260 | 62,060
Intangible Assets, Amortization |  | 7,656 |
Intangible Assets, Impairment |  | 28,354 |
Intangible Assets, Accumulated Amortization | (42,004) | (42,004) | (5,994)
Intangible Assets, Net | 21,256 | 21,256 | $ 56,066
Customer Contracts And Relationships [Member] | Minimum [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Useful Life |  |  | 5 years
Customer Contracts And Relationships [Member] | Maximum [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Useful Life |  |  | 15 years
Sales Contracts [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Cost | 2,500 | 2,500 | $ 2,500
Intangible Assets, Amortization |  | 312 |
Intangible Assets, Accumulated Amortization | (1,770) | (1,770) | (1,458)
Intangible Assets, Net | 730 | 730 | $ 1,042
Intangible Assets, Useful Life |  |  | 4 years
Permits [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Cost | 27,440 | 27,440 | $ 27,440
Intangible Assets, Amortization |  | 346 |
Intangible Assets, Accumulated Amortization | (6,242) | (6,242) | (5,896)
Intangible Assets, Net | $ 21,198 | $ 21,198 | $ 21,544
Intangible Assets, Useful Life |  |  | 40 years

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- Definition Gross amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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