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Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Non-Consolidating Affiliates	Sep. 30, 2012 Non-Consolidating Affiliates	Sep. 30, 2013 Non-Consolidating Affiliates	Sep. 30, 2012 Non-Consolidating Affiliates	Sep. 30, 2012 Customer Which Has Significant Interest In The Company	Sep. 30, 2012 Customer Which Has Significant Interest In The Company	Dec. 31, 2012 Customer Which Has Significant Interest In The Company Maximum	Sep. 30, 2012 Customer In Which Company's Directors Have Controlling Interest	Sep. 30, 2012 Customer In Which Company's Directors Have Controlling Interest	Sep. 30, 2013 Affiliate of Significant Shareholder	Sep. 30, 2013 Affiliate of Significant Shareholder
Related Party Transaction [Line Items]
Percent of ownership held											5.00%
Recognized net revenues	$ 190	$ 170	$ 571	$ 487					$ 117	$ 344		$ 53	$ 143	$ 190	$ 571
Cost of revenue					563	670	1,527	1,754
Selling, general and administrative expenses					135	198	356	408
Investment in equity affiliates						$ 0		$ 205

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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