Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	9 Months Ended
	Jan. 29, 2013	Sep. 30, 2013
Stockholders Equity Note [Line Items]
Common stock purchase price	$ 19.60
Net proceed from sale of common stock	$ 310,000	$ 310,037
Common Stock
Stockholders Equity Note [Line Items]
Shares of common stock sold	16,489,893