CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flow from operating activities:
Net income	$ 134,908,000	$ 62,903,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Net gain on mortgage loans held for sale at fair value	(108,560,000)	(68,487,000)
Amortization, impairment and change in fair value of mortgage servicing rights	16,363,000	9,024,000
Change in fair value of real estate acquired in settlement of loans	22,000
Stock and unit-based compensation expense	2,394,000	13,880,000
Amortization of debt issuance costs and commitment fees relating to financing facilities	3,714,000	1,261,000
Depreciation and amortization	594,000	389,000
Originations of mortgage loans held for sale	(895,405,000)	(304,402,000)
Sale and principal payments of mortgage loans held for sale	13,210,810,000	5,112,530,000
Increase in servicing advances	(12,192,000)	(12,989,000)
Increase in prepaid expenses	(9,094,000)	(3,457,000)
Repurchase of real estate acquired in settlement of loans subject to representations and warranties	(309,000)
Sale of real estate acquired in settlement of loans subject to representations and warranties	287,000
Decrease (increase) in other assets	4,087,000	(2,962,000)
Increase in accounts payable and accrued expenses	17,060,000	15,695,000
Net cash used in operating activities	(68,106,000)	(273,853,000)
Cash flow from investing activities:
Net (increase) decrease in short-term investment	(74,323,000)	12,625,000
Purchase of mortgage servicing rights	(5,124,000)
Sale of mortgage servicing rights	550,000
Purchase of furniture, fixtures, equipment and building improvements	(4,719,000)	(2,495,000)
Acquisition of capitalized software	(242,000)	(379,000)
Increase in margin deposits and restricted cash	5,349,000	(27,524,000)
Net cash used in investing activities	(78,509,000)	(17,773,000)
Cash flow from financing activities:
Sale of loans under agreements to repurchase	12,225,201,000	4,924,895,000
Repurchase of loans sold under agreements to repurchase	(12,230,851,000)	(4,641,117,000)
Increase in note payable	3,762,000	15,433,000
Issuance of excess servicing spread financing	2,828,000
Issuance of common stock	230,000,000
Payment of common stock underwriting and offering costs	(13,486,000)
Payment by noncontrolling interest of common stock issuance costs	(3,745,000)
Noncontrolling interest repayments of partners' capital contributions		15,058,000
Noncontrolling interest collection of subscriptions receivable		(6,000)
Noncontrolling interest distributions	(23,019,000)	(11,368,000)
Net cash provided by financing activities	190,690,000	302,895,000
Net increase in cash	44,075,000	11,269,000
Cash at beginning of period	12,323,000	16,465,000
Cash at end of period	56,398,000	27,734,000
Investment Funds
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Accrual of servicing rebate to affiliates	535,000	360,000
Carried Interest from Investment Funds	(10,411,000)	(7,254,000)
Decrease (increase) in receivable from affiliates	596,000	3,674,000
Increase (decrease) in payable to affiliate	(371,000)	4,821,000
PennyMac Mortgage Investment Trust
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Change in fair value of investment	196,000	(506,000)
Purchase from affiliate of mortgage loans held for sale	(12,429,698,000)	(5,111,185,000)
Decrease (increase) in receivable from affiliates	(1,790,000)	2,528,000
Increase (decrease) in payable to affiliate	$ 8,158,000	$ 10,325,000