Stock-Based Compensation - Summarized Information about Stock Options Outstanding by Range of Exercise Prices (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule Of Stock Options [Line Items]
Number Outstanding	855,101	809,017	443,658	215,000
Weighted Average Exercise Price, Options Outstanding	$ 13.48
Weighted Average Remaining Contractual Life, Options Outstanding	7 years
Number Exercisable	374,535
Weighted Average Exercise Price, Options Exercisable	$ 11.94	$ 10.60	$ 10.53
August 4, 2011 - September 30, 2011 [Member]
Schedule Of Stock Options [Line Items]
Range of Exercise Prices, Lower range	$ 10.00
Range of Exercise Prices, Upper range	$ 12.70
Number Outstanding	368,181
Weighted Average Exercise Price, Options Outstanding	$ 11.35
Weighted Average Remaining Contractual Life, Options Outstanding	5 years
Number Exercisable	292,074
Weighted Average Exercise Price, Options Exercisable	$ 11.11
October 1, 2011 - December 31, 2011 [Member]
Schedule Of Stock Options [Line Items]
Range of Exercise Prices, Lower range	$ 14.20
Range of Exercise Prices, Upper range	$ 14.88
Number Outstanding	351,870
Weighted Average Exercise Price, Options Outstanding	$ 14.68
Weighted Average Remaining Contractual Life, Options Outstanding	8 years
Number Exercisable	82,461
Weighted Average Exercise Price, Options Exercisable	$ 14.88
January 1, 2012 - March 31, 2012 [Member]
Schedule Of Stock Options [Line Items]
Range of Exercise Prices, Lower range	$ 15.88
Range of Exercise Prices, Upper range	$ 23.68
Number Outstanding	135,050
Weighted Average Exercise Price, Options Outstanding	$ 16.17
Weighted Average Remaining Contractual Life, Options Outstanding	9 years
Number Exercisable
Weighted Average Exercise Price, Options Exercisable