Subsequent Events - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended						64 Months Ended	1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Stock Repurchase Program	Dec. 31, 2012 Stock Repurchase Program	Dec. 31, 2011 Stock Repurchase Program	Dec. 31, 2013 Stock Repurchase Program	Feb. 28, 2014 Subsequent Event Stock Repurchase Program	Jan. 31, 2014 Subsequent Event Phantom Stock	Jan. 31, 2014 Subsequent Event Restricted Stock
Subsequent Event [Line Items]
Shares or units awarded to certain employees									3,590	73,785
Fair value of the stock award on the date of grant									$ 403	$ 8,278
Vesting period										3 years
Repurchased and retired, shares				75,000	60,000	55,000	1,952,576	36,969
Repurchased and retired, aggregate price	$ 5,834	$ 5,727	$ 6,649	$ 5,833	$ 5,727	$ 6,649	$ 84,134	$ 4,062