Stockholders' Equity - Summary of the Company's Stock Options Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, Granted	0	0
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, Options outstanding, beginning of year	6,321,076	7,576,493	7,507,236
Number of options, Granted			1,018,182
Number of options, Exercised	(2,671,058)	(784,383)	(539,923)
Number of options, Expired / terminated	(284,326)	(471,034)	(409,002)
Number of options, Options outstanding, end of year	3,365,692	6,321,076	7,576,493
Number of options, Options exercisable, end of year	3,217,146	5,278,243	6,432,667
Number of options, Options expected to vest, end of year	103,362
Weighted average exercise price, Options outstanding, beginning of year	$ 6.05	$ 5.75	$ 5.71
Weighted average exercise price, Granted			$ 4.65
Weighted average exercise price, Exercised	$ 5.75	$ 2.46	$ 2.64
Weighted average exercise price, Expired / terminated	$ 7.83	$ 7.15	$ 6.38
Weighted average exercise price, Options outstanding, end of year	$ 6.15	$ 6.05	$ 5.75
Weighted average exercise price, Options exercisable, end of year	$ 6.22	$ 6.31	$ 6.02
Weighted average exercise price, Options expected to vest, end of year	$ 4.54