Business Segments - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015 Segment	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Reportable business segments	3
Total revenues	$ (691,347,000)	$ (428,629,000)
Reclassification of goodwill			600,000,000
Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues	$ 18,377,000