Stockholders' Equity - Schedule of Quarterly Cash Dividends to Common Stockholders (Detail)	3 Months Ended
	Mar. 31, 2016 $ / shares
Stockholders Equity [Line Items]
Cash dividends declared per share	$ 0.42
Q4 2015 Declaration [Member]
Stockholders Equity [Line Items]
Cash dividends record date	Jan. 15, 2016
Cash dividends payable date	Jan. 22, 2016
Cash dividends declared per share	$ 0.21
Q1 2016 Declaration [Member]
Stockholders Equity [Line Items]
Cash dividends record date	Mar. 14, 2016
Cash dividends payable date	Apr. 01, 2016
Cash dividends declared per share	$ 0.21