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Goodwill - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Asia/Pacific
Jun. 30, 2013
Asia/Pacific
Jun. 30, 2014
Sub-Saharan Africa/Europe
Jun. 30, 2013
Sub-Saharan Africa/Europe
Goodwill [Line Items]            
Goodwill impairment test period     10 years      
Goodwill impairment charge    [1]    [2] $ 56,300         
Goodwill   $ 42,160 [2]       $ 42,160
[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.