Stockholders' Equity - Additional Information (Detail) - Q4 2015 Repurchase Program [Member] - USD ($) $ / shares in Units, shares in Millions		1 Months Ended
	Feb. 02, 2016	Feb. 29, 2016	Oct. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock acquired, average cost per share	$ 2.40	$ 2.50
Stock repurchase program, aggregate number of shares repurchased value	$ 101,900,000	$ 200,000,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount			$ 200,000,000
Common Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common stock	42.2	80.2