Segment Information - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Segment	Jun. 30, 2012
Segment Reporting Information [Line Items]
Number of reportable segments			2
Number of customers individually accounting for more than ten percent of total operating revenues	No single customer accounted for more than 10% of our total operating revenues	No single customer accounted for more than 10% of our total operating revenues	No single customer accounted for more than 10% of our total operating revenues	No single customer accounted for more than 10% of our total operating revenues
Percentage maximum accounted for	10.00%	10.00%	10.00%	10.00%
Wireline
Segment Reporting Information [Line Items]
Number of countries outside the United States of America to which our Wireline segment provides products and services	150		150