Stock-Based Compensation - Schedule of Information Regarding Standard and Market Condition Based Stock Options Outstanding (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Standard Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, Number of Shares	3,484,306	3,227,167	3,155,631
Options vested and expected to vest using estimated forfeiture rates, Number of Shares	3,258,924	2,994,044
Options exercisable, Number of Shares	1,995,982	1,774,546
Options outstanding, Weighted Average Exercise Price	$ 8.13	$ 7.78
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Exercise Price	$ 7.96	$ 7.61
Options exercisable, Weighted Average Exercise Price	$ 6.95	$ 6.67
Options outstanding, Weighted Average Remaining Contractual Life (years)	5 years 1 month 24 days	5 years 5 months 16 days
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Remaining Contractual Life (years)	5 years 1 month 6 days	5 years 4 months 28 days
Options exercisable, Weighted Average Remaining Contractual Life (years)	4 years 8 months 9 days	4 years 11 months 12 days
Options outstanding, Aggregate Intrinsic Value	$ 10.2	$ 9.9
Options vested and expected to vest using estimated forfeiture rates, Aggregate Intrinsic Value	10.0	9.6
Options exercisable, Aggregate Intrinsic Value	8.1	7.5
Market Condition Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, Number of Shares	50,000	0
Options vested and expected to vest using estimated forfeiture rates, Number of Shares	41,795
Options exercisable, Number of Shares	0
Options outstanding, Weighted Average Exercise Price	$ 11.94
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Exercise Price	$ 11.94
Options exercisable, Weighted Average Exercise Price	$ 0.00
Options outstanding, Weighted Average Remaining Contractual Life (years)	6 years 10 months 24 days
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Remaining Contractual Life (years)	6 years 10 months 24 days
Options exercisable, Weighted Average Remaining Contractual Life (years)	0 years
Options outstanding, Aggregate Intrinsic Value	0
Options vested and expected to vest using estimated forfeiture rates, Aggregate Intrinsic Value	0
Options exercisable, Aggregate Intrinsic Value	$ 0