Long-Term Cash Incentive Plan - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Long term incentive plan compensation	$ 360,000	$ 475,000
Long Term Incentive Plan 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Estimated payments for employee long term incentive plan	5,100,000
Deferred compensation cash-based arrangements, liability, current and noncurrent	$ 4,200,000