Long-Term Cash Incentive Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Accrued compensation expense		$ 2.6
Long Term Incentive Plan Twenty Thirteen [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Estimated payment of plan including employer cost	5.8
Accrued compensation expense	1.9
Long Term Incentive Plan Twenty Ten [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Accrued compensation expense		0.8
Payments For Employee Long Term Incentive Plan	$ 2.3