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Commitments and Contingencies - Summary of Liability Related to Lease (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012
Commitments And Contingencies Disclosure [Abstract]
Balance as of January 1		$ 1,103	$ 452
Net rental receipts (payments)		(410)	30
Accretion of discount		61	28
Increase in net estimated contract termination costs	1,100	1,144	127
Balance as of September 30	$ 1,898	$ 1,898	$ 637

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Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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