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Schedule of Intangible Assets, Including Impact of Impairment Charges (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Sep. 30, 2015 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2015
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets, Amortization Expense |  |  | $ 4,800 | $ 12,911 | $ 5,700
Intangible Assets, Impairment | $ 6,600 | $ 28,400 |  | 34,999 |
Intangible Assets, Accumulated Amortization | (61,258) |  | (66,065) | (61,258) |
Goodwill, Cost | 133,885 |  | 198,370 | 133,885 |
Goodwill, Net | 133,885 |  | 198,370 | 133,885 |
Total Goodwill and Intangible Assets, Cost | 227,085 |  | 301,570 | 227,085 |
Total Goodwill and Intangible Assets, Impairment |  |  |  | 34,999 |
Total Goodwill and Intangible Assets, Net | 165,827 |  | 235,505 | 165,827 |
Customer Contracts And Relationships [Member] |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets, Cost | 63,260 |  | 72,260 | 63,260 |
Intangible Assets, Amortization Expense |  |  |  | 11,634 |
Intangible Assets, Impairment |  |  |  | 34,999 |
Intangible Assets, Accumulated Amortization | (52,627) |  | (56,303) | (52,627) |
Intangible Assets, Net | 10,633 |  | $ 15,957 | $ 10,633 |
Intangible Assets, Useful Life |  |  | 15 years | 15 years |
Sales Contracts [Member] |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets, Cost | 2,500 |  | $ 2,500 | $ 2,500 |
Intangible Assets, Amortization Expense |  |  |  | 625 |
Intangible Assets, Accumulated Amortization | (2,083) |  | $ (2,500) | (2,083) |
Intangible Assets, Net | 417 |  |  | $ 417 |
Intangible Assets, Useful Life |  |  | 4 years | 4 years |
Permits [Member] |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets, Cost | 27,440 |  | $ 28,440 | $ 27,440 |
Intangible Assets, Amortization Expense |  |  |  | 652 |
Intangible Assets, Accumulated Amortization | (6,548) |  | (7,262) | (6,548) |
Intangible Assets, Net | $ 20,892 |  | $ 21,178 | $ 20,892 |
Intangible Assets, Useful Life |  |  | 40 years | 40 years |

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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=66902209&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=66006027&loc=d3e16323-109275 + Details
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