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Goodwill - Additional Information (Detail) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2013 Sub-Saharan Africa/Europe | Sep. 30, 2014 Sub-Saharan Africa/Europe | Sep. 30, 2013 Sub-Saharan Africa/Europe | Dec. 31, 2013 Asia/Pacific | Sep. 30, 2013 Asia/Pacific
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment test period |  |  |  |  |  |  |  | 10 years |
Goodwill impairment charge |  | [1] |  | [2] |  |  |  | $ 56,300,000 |
Goodwill |  |  | $ 42,160,000 | [2] | $ 42,200,000 |  | $ 42,160,000 |  |
[1] | The total carrying amount of goodwill at September 30, 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.
[2] | The total carrying amount of goodwill at September 30, 2013 is net of accumulated impairment charges $30.9 million related to the Middle East/North Africa segment.

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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