Goodwill - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2012
Goodwill [Line Items]
Goodwill impairment charge	$ 56,283	$ 56,283	$ 30,932
Goodwill		42,160
Asia/Pacific
Goodwill [Line Items]
Goodwill impairment test period	10 years
Goodwill impairment charge	56,300
Sub-Saharan Africa/Europe
Goodwill [Line Items]
Goodwill		$ 42,160