|
Segment Information - Additional Information (Detail)
|
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2013
Customer
Segment
|
Mar. 31, 2012
Customer
|
|
| Segment Reporting Information [Line Items] | ||
| Number of reportable segments | 2 | |
| Number of customers individually accounting for more than ten percent of total operating revenues | 0 | 0 |
| Percentage maximum accounted for | 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 | |