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Schedule of Goodwill by Reportable Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Americas
Jun. 30, 2013
Americas
Jun. 30, 2014
Sub-Saharan Africa/Europe
Jun. 30, 2013
Sub-Saharan Africa/Europe
Dec. 31, 2013
Asia/Pacific
Jun. 30, 2013
Asia/Pacific
Goodwill [Line Items]                
Goodwill, Beginning Balance $ 283,699 [1] $ 297,822 [2] $ 114,237 $ 114,237 $ 169,462 $ 127,302   $ 56,283
Goodwill acquired   42,160 [2]       42,160    
Impairments    [1]    [2]             56,300   
Goodwill, Ending Balance $ 283,699 [1] $ 339,982 [2] $ 114,237 $ 114,237 $ 169,462 $ 169,462   $ 56,283
[1] The total carrying amount of goodwill at June 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 June 30, 2013 is net of accumulated impairment charges $30.9 million related to the Middle East/North Africa segment.