Stockholders' Equity - Additional Information 2 (Detail) (2005 Contingent Stock Plan [Member])	12 Months Ended
	Dec. 31, 2014
2005 Contingent Stock Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average remaining contractual life of non vested restricted stock shares	1 year 4 months 24 days
Weighted-average remaining contractual life of non vested restricted stock units	1 year 7 months 6 days
Weighted-average remaining contractual life of non vested cash awards	1 year 7 months 6 days