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Schedule of Goodwill and Changes to Goodwill by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended							12 Months Ended		12 Months Ended
	Dec. 31, 2013	Mar. 31, 2014		Mar. 31, 2012		Mar. 31, 2014 Americas	Mar. 31, 2013 Americas	Mar. 31, 2012 Americas	Mar. 31, 2014 Asia/Pacific	Mar. 31, 2012 Asia/Pacific	Mar. 31, 2014 Sub-Saharan Africa/Europe	Mar. 31, 2012 Sub-Saharan Africa/Europe
Goodwill [Line Items]
Goodwill, Beginning Balance		$ 297,822	[1]			$ 114,237	$ 114,237	$ 114,237	$ 56,283	$ 56,283	$ 127,302	$ 127,302
Goodwill acquired		42,160									42,160
Impairments	56,283	56,283		30,932					56,283
Goodwill, Ending Balance		$ 283,699		$ 297,822	[1]	$ 114,237	$ 114,237	$ 114,237		$ 56,283	$ 169,462	$ 127,302
[1] The total carrying amount of goodwill at March 31, 2012 is net of accumulated impairment charges $30.9 million related to the Middle East/North Africa segment.

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