Long-Term Stock Incentive Plans - Narrative (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Long-Term Stock Incentive Plans:
Weighted average remaining contractual term of stock options outstanding, years	3 years 1 month 6 days	3 years 9 months 18 days
Weighted average remaining contractual term of stock options exercisable, years	3 years 1 month 6 days	3 years 9 months 18 days
Unrecognized compensation cost	$ 0	$ 0
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
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