Stockholders' Equity and Earnings Per Common Share - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013
Stockholders Equity and Earnings Per Common Share Additional Information [Abstract]
Exercise Price Floor on Outstanding Stock Options	$ 11.37
Exercise Price Ceiling on Outstanding Stock Options	$ 26.29
Outstanding Restricted Stock Unit Grant Prices Lower Limit	$ 19.38
Outstanding Restricted Stock Unit Grant Prices Upper Limit	$ 35.47
Outstanding Performance Share Unit Awards Grant Price Range Lower Limit	$ 23.97
Outstanding Performance Share Unit Awards Grant Price Range Upper Limit	$ 33.86
Number of Antidilutive Securities Excluded from Computation of Earnings Per Share	0	0	100,000
Authorized Shares of Preferred Stock	25,000,000	25,000,000
Par Value Per Share of Preferred Stock	$ 0.10	$ 0.10
Issued Shares of Preferred Stock	0	0