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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.