Goodwill - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013	Mar. 31, 2015		Mar. 31, 2014
Goodwill [Line Items]
Goodwill impairment charge	$ 283,699		$ 56,283	$ 283,699	[1]	$ 56,283
Asia/Pacific
Goodwill [Line Items]
Goodwill impairment charge			$ 56,300
Goodwill impairment test period			10 years
Sub-Saharan Africa/Europe
Goodwill [Line Items]
Goodwill impairment charge				$ 169,462
Goodwill		$ 42,200

[1] The total carrying amount of goodwill at March 31, 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.