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Schedule of Goodwill by Reportable Segment (Detail) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 Asia/Pacific | Sep. 30, 2013 Asia/Pacific | Sep. 30, 2014 Americas | Sep. 30, 2013 Americas | Jun. 30, 2013 Sub-Saharan Africa/Europe | Sep. 30, 2014 Sub-Saharan Africa/Europe | Sep. 30, 2013 Sub-Saharan Africa/Europe
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, Beginning Balance | $ 283,699,000 | [1] | $ 297,822,000 | [2] | $ 56,283,000 | $ 56,283,000 | $ 114,237,000 | $ 114,237,000 | $ 127,302,000 | $ 169,462,000 | $ 127,302,000
Goodwill acquired |  |  | 42,160,000 | [2] |  |  |  |  | 42,200,000 |  | 42,160,000
Impairments |  | [1] |  | [2] | 56,300,000 |  |  |  |  |  |
Goodwill, Ending Balance | $ 283,699,000 | [1] | $ 339,982,000 | [2] |  | $ 56,283,000 | $ 114,237,000 | $ 114,237,000 |  | $ 169,462,000 | $ 169,462,000
[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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