Share Repurchase Programs and Dividends - Summary of Cash Dividends Declared (Detail) - $ / shares	3 Months Ended						12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014
Equity [Abstract]
cash dividends declared, per share	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.40	$ 0.20