Share Based Compensation (Schedule of Changes in Number of Options Outstanding) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding exercisable options at December 31, 2013 Options	5,000
Weighted Average Exercise Price [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options forfeited per share	$ 34.55	$ 32.89	$ 22.55
Options outstanding at December 31	15,000	20,000	30,000	30,932
Options granted per share		$ 20.40
Average exercise price per share	$ 23.67
Aggregate exercise price	$ 357
Intrinsic value of options outstanding	31
Outstanding exercisable options at December 31, 2013 Options	8,750
Average exercise price per share	$ 28.30
Aggregate exercise price	248
Intrinsic value of options outstanding	15
2003 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options forfeited	(5,000)	0	(932)
Options outstanding at December 31	15,000	20,000	15,000	15,932
Options granted		5,000
Average exercise price per share	$ 23.67
Aggregate exercise price	357
Intrinsic value of options outstanding	31
Outstanding exercisable options at December 31, 2013 Options	8,750
Average exercise price per share	$ 28.30
Aggregate exercise price	248
Intrinsic value of options outstanding	15
1990 Non-Employee Trustee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options forfeited	0	(15,000)	0
Options outstanding at December 31	0	0	15,000	15,000
Options granted		0
Average exercise price per share	$ 0.00
Aggregate exercise price	0
Intrinsic value of options outstanding	0
Outstanding exercisable options at December 31, 2013 Options	0
Average exercise price per share	$ 0.00
Aggregate exercise price	0
Intrinsic value of options outstanding	$ 0