Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	May 31, 2010	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments And Contingencies [Line Items]
Lease cancellation notice period		30 days
Commitment to payment for services performed in next fiscal year		$ 5,200,000
Tenant improvement allowance	3,200,000	879,000	831,000
Term of optional lease extension	3 years
Rent expense		$ 803,000	$ 800,000	$ 1,000,000