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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.