Goodwill and Intangible Assets - Schedule of Goodwill and Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Schedule Of Goodwill And Intangible Assets [Line Items]
Goodwill, Beginning balance	$ 60,071
Goodwill and intangible assets, Beginning Balance	150,071
Goodwill, Acquired during the period
Goodwill, Ending balance	60,071		60,071
Intangible assets with a definite life, Beginning balance	250,947
Intangible assets with a definite life, Intangible assets amortization	(1,500)	(2,100)	(183,754)
Intangible assets with a definite life, Ending balance	251,613		250,947
Goodwill and intangible assets, Ending balance	149,394		150,071
Intangible assets with an indefinite life, Beginning balance	63,000
Intangible assets with an indefinite life, Acquired during the period
Intangible assets with an indefinite life, Ending balance	63,000		63,000
Atrium [Member]
Schedule Of Goodwill And Intangible Assets [Line Items]
Intangible assets with a definite life, Ending balance	26,323		27,000
Other [Member]
Schedule Of Goodwill And Intangible Assets [Line Items]
Goodwill and intangible assets, Beginning Balance	150,071
Goodwill and intangible assets, Acquired during the period
Intangible assets with a definite life, Intangible assets amortization	(677)
Goodwill and intangible assets, Ending balance	149,394
Other [Member] | Atrium [Member]
Schedule Of Goodwill And Intangible Assets [Line Items]
Intangible assets with a definite life, Beginning balance	27,000
Intangible assets with a definite life, Acquired during the period
Intangible assets with a definite life, Intangible assets amortization	(677)
Intangible assets with a definite life, Ending balance	26,323
Fair Value Adjustments [Member]
Schedule Of Goodwill And Intangible Assets [Line Items]
Intangible assets with a definite life, Beginning balance	223,947
Intangible assets with a definite life, Acquired during the period
Intangible assets with a definite life, Intangible assets amortization	1,343
Intangible assets with a definite life, Ending balance	$ 225,290