Share-Based Payments - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 100	$ 200	$ 518	$ 776
Options exercised by employee	6,500		6,500
Stock options cancelled			2,500
Long-Term Incentive Plan 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted under long-term incentive plan			180,000