Stock-Based Compensation Plans and Arrangements - Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Options
Outstanding at December 31, 2015 (in shares)	11,910,976
Granted (in shares)	0
Exercised (in shares)	(3,000,047)
Canceled (in shares)	(1,315,870)
Outstanding at December 31, 2016 (in shares)	7,595,059	11,910,976
Exercisable at December 31, 2016 (in shares)	7,589,682
Weighted Average Exercise Price per Share
Outstanding at December 31, 2015 (in dollars per share)	$ 10.08
Granted (in dollars per share)	0.00
Exercised (in dollars per share)	5.74
Canceled (in dollars per share)	18.56
Outstanding at December 31, 2016 (in dollars per share)	10.43	$ 10.08
Exercisable at December 31, 2016 (in dollars per share)	$ 6.13
Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term, Outstanding, ending balance (in years)	1 year 8 months 50 days
Weighted Average Remaining Contractual Term, Exercisable, ending balance (in years)	1 year 8 months 50 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding, ending balance	$ 39,357
Aggregate Intrinsic Value, Exercisable, ending balance	39,344
Total intrinsic value of options exercised	9,300	$ 13,700	$ 11,400
Cash received from option exercises	200
Tax benefit realized from exercise of stock options	$ 3,400