Stock Compensation Plans - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended															12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2008 20% of the shares issued	Dec. 31, 2007 20% of the shares issued	Dec. 31, 2006 20% of the shares issued	Dec. 31, 2013 25% of the shares issued	Dec. 31, 2012 25% of the shares issued	Dec. 31, 2011 25% of the shares issued	Dec. 31, 2010 25% of the shares issued	Dec. 31, 2009 Non-Employee Directors	Dec. 31, 2008 Non-Employee Directors	Dec. 31, 2007 Non-Employee Directors	Dec. 31, 2013 Employee Stock Option	Jun. 01, 2006 Employee Stock Option	Dec. 31, 2013 Employee Stock Option Maximum	Dec. 31, 2013 Performance Shares	Dec. 31, 2006 Performance Shares
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Common stock reserved for issuance															8,000,000
Options granted vesting period														4 years		10 years	5 years
Restricted stock-based compensation expense	$ 4,732	$ 3,725	$ 2,684
Incentive restricted stock issued				33,000	66,000	57,500	93,528	108,828	91,364	209,358	12,224	80,676	14,464					153,500
Shares granted exercise price				$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Percentage of shares vested				20.00%	20.00%	20.00%	25.00%	25.00%	25.00%	25.00%	25.00%	25.00%	25.00%
Cash received from options exercised	$ 0	$ 0	$ 2