Stock Compensation Plans - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		0 Months Ended								3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Aug. 21, 2012 Stock Appreciation Right	Aug. 21, 2012 Initial SAR	Jul. 21, 2013 Additional SAR	Jul. 02, 2013 Additional Stock Appreciation Rights Two	Jul. 02, 2013 Additional Stock Appreciation Rights Three	Jul. 02, 2013 Additional Stock Appreciation Rights Four	Jul. 16, 2013 2013 Omnibus Plan	Mar. 31, 2014 2013 Omnibus Plan	Mar. 31, 2014 Minimum	Mar. 31, 2014 Minimum Stock Option	Mar. 31, 2014 Maximum	Mar. 31, 2014 Maximum Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 923	$ 331
Total income tax benefit/ (expense)	$ 0	$ 2
Common stock shares authorized percentage under the plan									20.00%
Common stock available under new plan									2,384,711	2,173,750
Stock option vesting period												3 years		5 years
Stock option contractual term												7 years		10 years
Restricted award vested year											1 year		5 years
SAR period			10 years
SARs granted				500,000	150,933	88,366	15,275	70,877
Estimated fair value per share of SARs granted				$ 12.12	$ 13.00	$ 13.49	$ 13.49	$ 12.65