Stock Based Compensation and Employee Benefits - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended					0 Months Ended									12 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 Incentive Award Plan	Jan. 29, 2013 Restricted Stock	Jul. 30, 2013 Restricted Stock Non-management trustees	Jan. 29, 2013 Restricted Stock Non-management trustees Person	Jan. 29, 2013 Restricted Stock Employees	Jan. 29, 2013 Restricted Stock Executive Officers	Jan. 29, 2014 Restricted Stock Subsequent Event	Jan. 29, 2014 Restricted Stock Subsequent Event Non-management trustees Person	Jan. 29, 2014 Restricted Stock Subsequent Event Employees	Jan. 29, 2014 Restricted Stock Subsequent Event Executive Officers	Dec. 31, 2013 Phantom Units	Dec. 31, 2012 Phantom Units	Dec. 31, 2011 Phantom Units	Jan. 29, 2013 Stock Appreciation Rights (SARs)	Jan. 24, 2012 Stock Appreciation Rights (SARs)	Jan. 29, 2014 Stock Appreciation Rights (SARs) Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares to be issued					4,000,000
Common shares available for issuance					2,425,941
Number of shares awarded, share							6,578	43,536	369,500	369,500		36,186	293,700	293,700				1,127,500	2,172,000	891,600
Number of shares awarded, value	$ 1,332	$ 6,091					$ 50	$ 300	$ 2,577	$ 2,577		$ 300	$ 2,435	$ 2,435				$ 1,332	$ 6,091	$ 1,178
Closing stock price							$ 7.60	$ 6.89	$ 6.89	$ 6.89		$ 8.29	$ 8.29	$ 8.29
Number of individuals to whom shares are awarded								6				6
Remaining awards vesting period							3 months	9 months
Vesting period						3 years					3 years							3 years	3 years	3 years
Number of phantom units redeemed during that period															0	220,823	340,649
Phantom units forfeited															0	0	0
Phantom units outstanding															195,943	195,943
Deferred compensation costs related to unvested award															0	180
Weighted average remaining vesting period															0 years
Expiration date																		Jan. 29, 2018	Jan. 24, 2017	Jan. 29, 2019
Stock option term	10 years
Stock option outstanding	5,749	32,265	38,932	56,267
Share based compensation expense	3,441	2,208	541
Percentage of employer matching contribution	4.00%
Percentage of additional contribution	2.00%
Percentage employer matching contribution vesting per year	33.00%
Contribution expense	$ 435	$ 478	$ 482