Share-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of options granted during period	$ 2.35	$ 2.54	$ 7.30
Total intrinsic value of options exercised	$ 100,000		$ 400,000
Exercised (in shares)	(2,820)	0
Deferred compensation obligation	(677,000)	(2,000)	257,000
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	10 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Employees retirement age	62 years
Years of service	10 years
Unrecognized compensation cost	1,700,000
Unrecognized compensation cost weighted-average recognition period	0 years 9 months 18 days
Total grant-date fair values of stock that vested	2,700,000	4,700,000	3,700,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Total grant-date fair values of stock that vested			500,000
Deferred Common Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	46,134
Granted (in dollars per share)	$ 5.58
Deferred compensation obligation	2,800,000	3,100,000	3,600,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Unrecognized compensation cost	1,500,000
Unrecognized compensation cost weighted-average recognition period	1 year 1 month 6 days
Total grant-date fair values of stock that vested	1,700,000	1,400,000	900,000
Granted (in shares)	754,474
Granted (in dollars per share)	$ 3.91
Incremental common shares attributable to participating nonvested shares with non-forfeitable dividend rights, vesting period	30 days
Performance Based Restricted Stock Units (PBRSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Granted (in shares)	360,486
Granted (in dollars per share)	$ 4.91
Performance Based Restricted Stock Units (PBRSUs) | Other Noncurrent Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value	$ 4,800,000
Performance Based Restricted Stock Units (PBRSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares expected to vest at grant date	0.00%
Performance Based Restricted Stock Units (PBRSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares expected to vest at grant date	200.00%
Vests rateably over 3 years | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting description	One-third vesting in each year
Award vesting rights percentage	33.33%
Vests rateably over 3 years | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting description	One-third vesting in each year
Award vesting rights percentage	33.33%
Vests rateably over 3 years | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting description	One-third vesting in each year
Award vesting rights percentage	33.33%
Performance Period 1 | Performance Based Restricted Stock Units (PBRSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	1 year
Performance Period 2 | Performance Based Restricted Stock Units (PBRSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	2 years
Performance Period 3 | Performance Based Restricted Stock Units (PBRSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance	3,364,758.000
Non-employee Director | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	77,598	79,700
Granted (in dollars per share)	$ 5.39	$ 5.33