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Schedule of Goodwill and Changes to Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Mar. 31, 2015 | Mar. 31, 2014
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill, Beginning Balance | [1] |  | $ 283,699 |  | $ 283,699 |  |
Impairments |  | $ 283,699 |  | $ 56,283 | 283,699 | [1] | $ 56,283
Goodwill, Ending Balance | [1] |  |  |  |  |  | 283,699
Americas |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill, Beginning Balance |  |  | 114,237 |  | 114,237 |  |
Impairments |  |  |  |  | 114,237 |  |
Goodwill, Ending Balance |  |  |  |  |  |  | 114,237
Sub-Saharan Africa/Europe |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill, Beginning Balance |  |  | 169,462 |  | 169,462 |  |
Goodwill acquired |  |  | $ 42,200 |  |  |  |
Impairments |  |  |  |  | $ 169,462 |  |
Goodwill, Ending Balance |  |  |  |  |  |  | $ 169,462
[1] | The total carrying amount of goodwill at March 31, 2014 is net of accumulated impairment charges $30.9 million and $56.3 million related to the Middle East/North Africa and Asia/Pacific segments, respectively.

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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=35741047&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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