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Assets Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Assets
Other investments	$ 63,985	$ 73,326
Iridium \| Common Stock
Assets
Other investments	62,035	68,881
Deferred Compensation Plan Investments
Assets
Other investments	144	2,338
Fair Value, Measurements, Recurring
Assets
Other investments	62,179	71,219
Fair Value, Measurements, Recurring \| Iridium \| Common Stock
Assets
Other investments	62,035	68,881
Fair Value, Measurements, Recurring \| Deferred Compensation Plan Investments
Assets
Other investments	144	2,338
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Other investments	62,035	68,881
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Iridium \| Common Stock
Assets
Other investments	62,035	68,881
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Assets
Other investments	144	2,338
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Deferred Compensation Plan Investments
Assets
Other investments	$ 144	$ 2,338

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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