Segment Information (Tables)

6 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area

The following table presents the summary segment information for the three months and six months ended September 30, 2013 and 2012:       

	Three Months Ended September 30,					Six Months Ended September 30,
	2013			2012		2013			2012
Sales and other operating revenues:
South America	$	346,604		$	272,993	$	533,882		$	451,338
Value added services	29,857			33,568		60,937			67,200
Other regions	324,219			269,850		489,748			415,643
Total revenue	$	700,680		$	576,411	$	1,084,567		$	934,181
Operating income:
South America	$	22,690		$	24,893	$	29,542		$	25,762
Value added services	2,957			6,482		5,529			8,130
Other regions	22,603			18,449		5,230			21,211
Total operating income	48,250			49,824		40,301			55,103
Debt retirement expense	55,582			—		55,599			—
Interest expense	31,684			29,776		60,527			56,891
Interest income	1,859			1,121		3,845			2,119
Income (loss) before income taxes and other items	$	(37,157	)	$	21,169	$	(71,980	)	$	331

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country

Analysis of Segment Assets		September 30, 2013		September 30, 2012		March 31, 2013
Segment assets:
	South America	$	661,696	$	717,526	$	616,946
	Value added services	209,574		158,591		197,959
	Other regions	1,249,372		1,355,053		1,096,674
	Total assets	$	2,120,642	$	2,231,170	$	1,911,579