Stock-Based Compensation Plans (Summary of Unrecognized Compensation Expense) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense, Stock options	$ 654
Weighted-Average Period To Be Recognized	1 year 3 months
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense, Restricted stock	$ 11,659
Weighted-Average Period To Be Recognized	2 years 0 months