Schedule I - Financial Information - Additional Information (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Disclosure of Cash Flow Information
Cash paid for interest	$ 316,094,000us-gaap_InterestPaid	$ 278,679,000us-gaap_InterestPaid	$ 209,943,000us-gaap_InterestPaid
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Real estate owned acquired through foreclosure	122,213,000us-gaap_TransferToOtherRealEstate	107,629,000us-gaap_TransferToOtherRealEstate	73,513,000us-gaap_TransferToOtherRealEstate
Residential loans originated to finance the sale of real estate owned	52,130,000	63,219,000	58,376,000
Issuance of common stock for business acquisitions	0us-gaap_StockIssued1	0us-gaap_StockIssued1	41,346,000us-gaap_StockIssued1
Parent Company [Member]
Supplemental Disclosure of Cash Flow Information
Cash paid for interest	132,422,000	100,464,000	64,603,000
Cash paid (received) for income taxes	(6,067,000)	91,646,000	28,728,000
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Real estate owned acquired through foreclosure	671,000	657,000	870,000
Residential loans originated to finance the sale of real estate owned	1,657,000	1,962,000	2,925,000
Issuance of common stock for business acquisitions	0	0	41,346,000
Transfer of fixed assets	0	0	532,000
Parent Company [Member] \| Revolving Credit Facility [Member]
Term loan	$ 125,000,000

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