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Other current liabilities - Summary of Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts Payable And Accrued Liabilities [Line Items]
Accrued expenses	$ 19,297	$ 14,001
Salaries, bonuses, commissions and related taxes payable	18,337	22,742
Other payables	9,335	8,584
Total	$ 46,969	$ 45,327

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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- Definition

Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are due within one year or operating cycle, if longer, from the balance sheet date.

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