Commitments and Contingencies (Narrative) (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended											1 Months Ended		12 Months Ended
	Dec. 31, 2013 Officers	Dec. 31, 2012	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2013 Officer [Member]	Dec. 31, 2013 Officer [Member] Minimum [Member]	Dec. 31, 2013 Officer [Member] Maximum [Member]	Dec. 31, 2013 Chief Executive Officer [Member]	Dec. 31, 2013 Mr. Rubin [Member]	Jun. 07, 2013 Mr. Rubin [Member]	Feb. 28, 2013 Mr. Rubin [Member] Restricted Stock [Member]	Oct. 31, 2012 Mr. Glickman [Member]	Dec. 31, 2013 Mr. Glickman [Member]
Employee Separation Expenses [Line Items]
Unaccrued contractual and other commitments	$ 1.7
Number of officers	5
Initial year of employment agreement of employee							1 year	3 years	2 years	3 years
Renewal of agreements term						1 year			1 year	1 year
Aggregate base compensation	2.1
Notice of non-renewal days									120 days	120 days
Total to be recorded for the year December 31, 2013										4.5
Total to be recorded for the year December 31, 2012										2.6
Total cash to be recorded for the year December 31, 2012										1.9			2.7
RSUs granted			253,920	459,526	358,234							16,000
Fair Value												0.3
Grant date fair value (in dollars per share)			$ 18.54	$ 14.46	$ 14.50							$ 18.28
Founder's retirement payment											3.5
Employee separation expense														4.1
Termination expenses	2.7
Separation payment													2.8
Separation expenses for employees		2.7
Environmental insurance coverage claims per occurrence	10.0
Environmental insurance coverage claims aggregate	$ 20.0