Long-Term Cash Incentive Plan - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Accrued Long Term Incentive Plan Compensation	$ 1,425,000	$ 1,431,000
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent	3,300,000
Long Term Incentive Plan Twenty Thirteen [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Estimated Payments For Employee Long Term Incentive Plan	$ 5,800,000