Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Jan. 08, 2016	Jan. 29, 2013	Dec. 31, 2015	Dec. 31, 2013	Dec. 31, 2014	Nov. 01, 2013	Jun. 20, 2013
Stockholders Equity Note [Line Items]
Preferred stock, authorized			10,000,000		10,000,000
Common stock, authorized			450,000,000		450,000,000		240,000,000
Shares of common stock sold		16,489,893
Common stock purchase price		$ 19.60
Net proceed from sale of common stock		$ 310,000		$ 310,037
Number of preferred share rights issued per share of common stock outstanding						1
Percentage of ownership that triggers rights separation from common stock						4.99%
Percentage of additional shares over 4.99% threshold that would trigger dilutive ownership events if acquired						0.50%
Subsequent Event
Stockholders Equity Note [Line Items]
Plan expiration date	Oct. 30, 2016
Subsequent Event | After amendment
Stockholders Equity Note [Line Items]
Plan expiration date	Jan. 08, 2016
Series A Junior Preferred Stock
Stockholders Equity Note [Line Items]
Preferred stock, authorized			500,000
Preferred stock, voting rights			1,000 to 1 basis with each share of common stock