Goodwill - Narrative (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill	$ 94,781,000	$ 55,417,000
Impairment Charge	23,987,000
Merganser
Goodwill and Intangible Assets Disclosure [Line Items]
Reduction of goodwill related to Merganser	32,400,000
Impairment Charge	24,000,000
Reduction of goodwill from sale of assets	8,400,000
CreXus
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill	71,350,000
Goodwill	$ 71,800,000