Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2014	Dec. 31, 2013
Significant Accounting Policies [Line Items]
Prior period reclassification adjustment	$ 2,771	$ 5,494
Accounts receivable, allowance for doubtful accounts			$ 7,550	$ 8,695