Stock-Based Compensation - Summary of Company's Stock Option Plan Activity' (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward]
Outstanding Beginning, Number of Options	280,000	280,000	280,000
Exercised, Number of Options	(50,000)
Outstanding Ending, Number of Options	230,000	280,000	280,000	280,000
Exercisable Ending, Number of Options	220,000	260,000
Outstanding Beginning, Weighted Average Exercise price	$ 2.91	$ 2.91	$ 2.91
Exercised, Weighted-Average Exercise Price	$ 2.50
Outstanding Ending, Weighted-Average Exercise Price	$ 3.00	$ 2.91	$ 2.91	$ 2.91
Exercisable Ending , Weighted-Average Exercise Price	$ 2.85	$ 2.65
Outstanding, Weighted-Average Remaining Contractual Term	3 years 9 months 18 days	4 years 8 months 12 days	3 years 10 months 24 days	4 years 10 months 24 days
Exercisable Ending, Weighted-Average Remaining Contractual Term	3 years 7 months 6 days	4 years 4 months 24 days
Outstanding Beginning, Aggregate Intrinsic Value	$ 14,166	$ 5,007	$ 5,007
Outstanding Ending, Aggregate Intrinsic Value	7,683	6,816	14,166	5,007
Exercisable Ending, Aggregate Intrinsic Value	$ 7,382	$ 6,397