Stock Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended		39 Months Ended	6 Months Ended		1 Months Ended
	Jun. 30, 2011 Year	Jun. 30, 2011 Maximum Omnibus Incentive Plan	Jun. 30, 2011 Omnibus Incentive Plan	Jun. 30, 2011 Restricted Stock Year	Jun. 30, 2011 Maximum Stock Options	Jan. 31, 2011 Non Employee Directors, Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash-based award paid to a single participant in any calendar year		$ 2,000
Aggregate number of common stock for issuance under the plan		750,000
Shares granted to any single participant in any calandar year		50,000
Shares available for issuance under the plan			615,186
Vesting period				3 years	10 years
Total shares issued under the deferred compensation plan for the period						4,058
Deferred fees paid under the plan for the period						171
Weighted-average remaining options contractual terms (years)	1.3
Total instrinsic value of options exercised	346
Total unrecognized compensation expense, net				6,684
Unrecognized compensation expense, net, weighted average period				1.7
Total fair value of restricted stock vested				2,507
Units granted			21,565
Units vested			12,153
Units forfeited			790
Total fair value of units outstanding			$ 1,405