Common Stock and Share-Based Compensation - Summary Options Outstanding and Exercisable (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
$8.96 to $10.44
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, Lower limit	$ 8.96
Exercise price range, Upper limit	$ 10.44
Number Outstanding, Options Outstanding	602,181
Weighted-Average Remaining Contractual Life, Options Outstanding	7 years 6 months 15 days
Weighted-Average Exercise Price, Options Outstanding	$ 9.89
Number Exercisable, Options Exercisable	293,790
Weighted-Average Exercise Price, Options Exercisable	$ 9.69
11.46 to 15.84
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, Lower limit	$ 11.46
Exercise price range, Upper limit	$ 15.84
Number Outstanding, Options Outstanding	806,928
Weighted-Average Remaining Contractual Life, Options Outstanding	2 years 9 months 7 days
Weighted-Average Exercise Price, Options Outstanding	$ 14.74
Number Exercisable, Options Exercisable	782,232
Weighted-Average Exercise Price, Options Exercisable	$ 14.78
16.18 to 16.98
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, Lower limit	$ 16.18
Exercise price range, Upper limit	$ 16.98
Number Outstanding, Options Outstanding	81,332
Weighted-Average Remaining Contractual Life, Options Outstanding	4 years 7 months 10 days
Weighted-Average Exercise Price, Options Outstanding	$ 16.81
Number Exercisable, Options Exercisable	81,332
Weighted-Average Exercise Price, Options Exercisable	$ 16.81
17.36
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, Upper limit	$ 17.36
Number Outstanding, Options Outstanding	659,567
Weighted-Average Remaining Contractual Life, Options Outstanding	4 years 10 months 21 days
Weighted-Average Exercise Price, Options Outstanding	$ 17.36
Number Exercisable, Options Exercisable	659,567
Weighted-Average Exercise Price, Options Exercisable	$ 17.36
17.48 to 21.90
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, Lower limit	$ 17.48
Exercise price range, Upper limit	$ 21.90
Number Outstanding, Options Outstanding	332,709
Weighted-Average Remaining Contractual Life, Options Outstanding	1 year 8 months 9 days
Weighted-Average Exercise Price, Options Outstanding	$ 20.10
Number Exercisable, Options Exercisable	332,709
Weighted-Average Exercise Price, Options Exercisable	$ 20.10
21.96
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, Upper limit	$ 21.96
Number Outstanding, Options Outstanding	562,454
Weighted-Average Remaining Contractual Life, Options Outstanding	3 years 6 months 7 days
Weighted-Average Exercise Price, Options Outstanding	$ 21.96
Number Exercisable, Options Exercisable	562,454
Weighted-Average Exercise Price, Options Exercisable	$ 21.96
22.22
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, Upper limit	$ 22.22
Number Outstanding, Options Outstanding	937,290
Weighted-Average Remaining Contractual Life, Options Outstanding	1 year 10 months 24 days
Weighted-Average Exercise Price, Options Outstanding	$ 22.22
Number Exercisable, Options Exercisable	937,290
Weighted-Average Exercise Price, Options Exercisable	$ 22.22
22.34 to 25.18
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, Lower limit	$ 22.34
Exercise price range, Upper limit	$ 25.18
Number Outstanding, Options Outstanding	273,995
Weighted-Average Remaining Contractual Life, Options Outstanding	3 years 8 months 27 days
Weighted-Average Exercise Price, Options Outstanding	$ 23.18
Number Exercisable, Options Exercisable	273,995
Weighted-Average Exercise Price, Options Exercisable	$ 23.18
26.06
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, Upper limit	$ 26.06
Number Outstanding, Options Outstanding	711,305
Weighted-Average Remaining Contractual Life, Options Outstanding	2 years 9 months 26 days
Weighted-Average Exercise Price, Options Outstanding	$ 26.06
Number Exercisable, Options Exercisable	711,305
Weighted-Average Exercise Price, Options Exercisable	$ 26.06
26.52 to 27.60
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, Lower limit	$ 26.52
Exercise price range, Upper limit	$ 27.60
Number Outstanding, Options Outstanding	87,274
Weighted-Average Remaining Contractual Life, Options Outstanding	3 years 3 months 11 days
Weighted-Average Exercise Price, Options Outstanding	$ 27.27
Number Exercisable, Options Exercisable	87,274
Weighted-Average Exercise Price, Options Exercisable	$ 27.27