Acquisition - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
Sep. 30, 2012
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash paid for acquired entity	$ 85.0
Decrease in additional paid-in capital due to acquisition	85.9
Transaction direct costs	0.9
Brightstar Corp. [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Percentage of ownership interest acquired	50.00%
Cash paid for acquired entity	$ 165.9

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 24

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant