Stock Options and Restricted Stock - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation expense	$ 2,300,000	$ 6,500,000	$ 8,400,000
Excess tax benefits included in cash provided by financing activities	1,381,000	5,967,000	1,264,000
Aggregate number of shares of common stock issued or transferred under the incentive stock awards plan	14,597,927
Unexercised options lapse period	10 years
Stock options granted	0	0	0
Aggregate Intrinsic value of options exercised	10,987,000	20,000,000	5,500,000
Fair value of options vested	2,700,000	2,200,000	2,700,000
Income tax expense benefit resulting from stock options exercised	4,200,000	8,400,000	2,100,000
Separation costs		10,400,000	3,500,000
Separation costs related to share based compensation		1,700,000
Vested		25,000	50,000
Incremental compensation cost resulting from modification	1,200,000	1,300,000
Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized compensation expense related to non-vested award	9,100,000
Unrecognized compensation expense related to non-vested award, recognition period	2 years 3 months 18 days
Stock options | Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period	2 years
Stock options | Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period	5 years
Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock granted	307,000	368,000	266,000
Weighted average grant date fair value	$ 29.23	$ 26.08	$ 23.57
Total fair value of shares vesting	$ 722,000	$ 4,400,000	$ 5,700,000
Vested	6,000
Restricted Stock | Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period	2 years
Restricted Stock | Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period	5 years
Restricted stock awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vested		75,000	150,000