Long-Term Stock Incentive Plans - Narrative (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Long-Term Stock Incentive Plans:
Weighted average remaining contractual term of stock options outstanding, years	2 years 9 months 18 days	3 years 6 months
Weighted average remaining contractual term of stock options exercisable, years	2 years 9 months 18 days	3 years 6 months
Unrecognized compensation cost	$ 0	$ 0
The Prior Plan | Minimum
Long-Term Stock Incentive Plans:
Long-term stock compensation - ceiling shares	500,000
Long-term stock compensation - granting of options authorized, percent of diluted outstanding common stock	9.50%
The Prior Plan | Maximum
Long-Term Stock Incentive Plans:
Long-term stock compensation - ceiling shares	8,932,921
Stock Options
Long-Term Stock Incentive Plans:
Long-term stock compensation - vesting period	4 years
Long-term stock compensation - vesting installments	4 years
Long-term stock compensation - minimum contractual term	5 years
Long-term stock compensation - maximum contractual term	10 years
Equity Incentive Plan 2010
Long-Term Stock Incentive Plans:
Long-term stock compensation - ceiling shares	25,000,000