Preferred Stock - Additional Information (Detail) - USD ($)							3 Months Ended	12 Months Ended
	Jul. 24, 2015	Apr. 27, 2015	Jan. 26, 2015	Oct. 27, 2014	Jul. 29, 2014	Apr. 30, 2014	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Apr. 29, 2014
Class of Stock [Line Items]
Amount of Non Voting Series A Preferred Stock Purchase price								$ 54,000,000	$ 126,000,000
Redemption of issued and outstanding Preferred Stock, par value								$ 0.01	$ 0.01
Increase in fair value of preferred stock derivative							$ 15,000,000	$ 15,000,000
Non-Voting Series A Preferred Stock [Member]
Class of Stock [Line Items]
Issuance of non-voting Series A Preferred Stock, shares issued						9,000
Non-voting Series A Preferred Stock, maximum number of shares issued	1,800	1,800	1,800	1,800	1,800
Non-voting Series A Preferred Stock, shares purchased price						$ 90,000,000
Amount of Non Voting Series A Preferred Stock Purchase price	$ 18,000,000	$ 18,000,000	$ 18,000,000	$ 18,000,000	$ 18,000,000
Non-voting Series A Preferred Stock, maximum aggregate consideration										$ 180,000,000
Non-voting Series A Preferred Stock, cumulative, non-participating cash dividend						0.10%
Redemption of preferred stock at purchase price								$ 10,000
Redemption of issued and outstanding Preferred Stock, par value								$ 0.01
Non-Voting Series A Preferred Stock [Member] | Maximum [Member]
Class of Stock [Line Items]
Non-voting Series A Preferred Stock, maximum number of shares issued										18,000
Preferred Stock [Member]
Class of Stock [Line Items]
Derivative instruments, assets								$ 18,000,000	$ 3,000,000