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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract]
Total rent expense and related taxes and operating expenses, under operating leases	$ 5,220	$ 5,759
Tax reserves, non-income tax related	$ 729		$ 703

Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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