Stock Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended			9 Months Ended		1 Months Ended	42 Months Ended
	Sep. 30, 2011 Year	Sep. 30, 2011 Maximum Omnibus Incentive Plan	Sep. 30, 2011 Omnibus Incentive Plan	Sep. 30, 2011 Restricted Stock Year	Sep. 30, 2011 Maximum Stock Options	Jan. 31, 2011 Non Employee Directors, Plan	Sep. 30, 2011 Phantom Stock Units
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
Total instrinsic value of options exercised	346
Total unrecognized compensation expense, net				5,720
Unrecognized compensation expense, net, weighted average period				1.5
Total fair value of restricted stock vested				2,507
Units granted							21,565
Units vested							12,487
Units forfeited							790
Total fair value of units outstanding							$ 850