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Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Other Current Liabilities [Line Items]
Amounts received in advance of revenue recognition	$ 16,071	$ 10,434
Amounts due to former customers	195	4,172
Other current liabilities	16,807	15,136
Other
Other Current Liabilities [Line Items]
Other current liabilities	$ 541	$ 530

Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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