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Schedule of Goodwill and Changes to Goodwill by Reportable Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Goodwill [Line Items]      
Goodwill, Beginning Balance [1] $ 283,699   $ 283,699
Goodwill acquired   $ 0 [2] 0 [1]
Impairments 283,700 0 [2] 0 [1]
Goodwill, Ending Balance [1]     283,699
Americas      
Goodwill [Line Items]      
Goodwill, Beginning Balance 114,237   114,237
Goodwill acquired   0 0
Impairments   0 0
Goodwill, Ending Balance     114,237
Sub-Saharan Africa/Europe      
Goodwill [Line Items]      
Goodwill, Beginning Balance $ 169,462   169,462
Goodwill acquired   0 0
Impairments   $ 0 0
Goodwill, Ending Balance     $ 169,462
[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 March 31, 2015 and September 30, 2015 is net of accumulated impairment charges of $370.9 million.