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Description of Business, Basis of Presentation and Accounting Policies (Policy)	9 Months Ended
	Sep. 30, 2011
Description of Business, Basis of Presentation and Accounting Policies [Abstract]
Change In Presentation Policy [Text Block]	Changes in Presentation—Changes have been made to the presentation of gross purchases and sales of short-term investments within the condensed consolidated statements of cash flows for the nine months ended September 30, 2010.
Consolidation Policy [Text Block]	Principles of Consolidation and Basis of Presentation—The accompanying condensed consolidated financial statements include the accounts of the Company and those subsidiaries and joint ventures in which it has a controlling interest. Investments in entities that the Company does not control are accounted for using the equity or cost method, depending upon the Company's ability to exercise significant influence over operating and financial policies.
Significant Accounting Policies And Use Of Estimates Policy [Text Block]	Significant Accounting Policies and Use of Estimates—The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Actual results may differ from those estimates, and such differences could be material to the accompanying condensed consolidated financial statements. The Company considers events or transactions that occur after the balance sheet date but before the financial statements are issued as additional evidence for certain estimates or to identify matters that require additional disclosure.
Concentration Risk Disclosure Text Block	Concentrations of Credit Risk—The Company is subject to concentrations of credit risk related to its cash and cash equivalents, notes receivable, trade receivables and deferred rent asset. The Company mitigates its risk with respect to cash and cash equivalents by maintaining its deposits and contracts at high quality financial institutions and monitoring the credit ratings of those institutions. The Company derives the largest portion of its revenues, corresponding trade receivables and the related deferred rent asset from a small number of customers in the telecommunications industry. Approximately 53% of its revenues are derived from four customers. In addition, the Company has concentrations of credit risk in certain geographic areas. The Company mitigates its concentrations of credit risk with respect to notes and trade receivables and the related deferred rent asset by actively monitoring the credit worthiness of its borrowers and customers. In recognizing customer revenue, the Company must assess the collectability of both the amounts billed and the amounts recognized on a straight-line basis. This assessment takes customer credit risk and business and industry conditions into consideration to ultimately determine the collectability of the amounts billed. To the extent the amounts, based on management's estimates, may not be collectable when billed, recognition is deferred until such point as the uncertainty is resolved. Any amounts which were previously recognized as revenue and subsequently determined to be uncollectible are charged to bad debt expense. The Company's largest international customer is Iusacell, which is the brand name under which a group of companies controlled by Grupo Iusacell, S.A. de C.V. (“Grupo Iusacell”) operates. Iusacell represented approximately 4% of the Company's total revenue for nine months ended September 30, 2011. Grupo Iusacell has been engaged in a refinancing of a majority of its U.S. Dollar denominated debt, and in connection with this, two of the legal entities of the group, including Grupo Iusacell, voluntarily filed for a pre-packaged Concurso Mercantil (a process substantially equivalent to Chapter 11 of U.S. Bankruptcy Law) with the backing of a majority of their financial creditors in December 2010 and subsequently concluded the process in April 2011 after a Mexican court ruled in favor of the refinancing plan presented by the two legal entities. As of September 30, 2011, Iusacell notes receivable, net, and related assets (which include financing lease commitments and a deferred rent asset that are primarily long-term in nature) were $17.4 million and $56.3 million, respectively.

Describes an entity's accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. An entity also may describe its accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

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