Share-Based Compensation Plans - Summary of Activity Related to Stock Options Granted under Company's Incentive Plan (Detail) (Employee Stock Option [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Shares outstanding, Beginning balance	4,229	4,964	4,026
Total Shares, Granted	25	0	1,250
Total Shares, Exercised	(1,160)	(611)	(140)
Total Shares, Forfeited, canceled or expired	(71)	(124)	(172)
Total Shares outstanding, Ending balance	3,023	4,229	4,964
Total Shares, Exercisable	2,049
Total Shares, Available for issuance	2,308
Weighted Average Exercise Price per Share Outstanding, Beginning balance	$ 14.57	$ 14.47	$ 14.24
Weighted Average Exercise Price per Share, Granted	$ 24.97		$ 15.34
Weighted Average Exercise Price per Share, Exercised	$ 14.03	$ 13.16	$ 12.00
Weighted Average Exercise Price per Share, Forfeited, canceled or expired	$ 17.22	$ 17.63	$ 17.29
Weighted Average Exercise Price per Share Outstanding, Ending balance	$ 14.80	$ 14.57	$ 14.47
Weighted Average Exercise Price per Share, Exercisable	$ 13.61
Weighted Average Remaining Contractual Term (Years), Outstanding	5 years 10 months 2 days
Weighted Average Remaining Contractual Term (Years), Exercisable	5 years 3 months 29 days
Aggregate Intrinsic Value, Outstanding	$ 87,073
Aggregate Intrinsic Value, Exercisable	$ 61,442