Commitments and Contingencies - Summary of Liability Related to Lease (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract]
Balance as of January 1,	$ 1,103	$ 452
Net rental receipts (payments)	(558)	(115)
Accretion of discount	98	39
Increase in net estimated contract termination costs	1,144	727
Balance as of December 31,	$ 1,787	$ 1,103