Related party transactions with affiliated company - Additional Information (Detail) (USD $)			6 Months Ended		9 Months Ended	12 Months Ended	3 Months Ended		6 Months Ended					3 Months Ended	6 Months Ended			3 Months Ended						6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Prlp2011 Holdings Llc Joint Venture [Member]	Jun. 30, 2012 Prlp2011 Holdings Llc Joint Venture [Member]	Sep. 30, 2011 Prlp2011 Holdings Llc Joint Venture [Member]	Dec. 31, 2012 Prlp2011 Holdings Llc Joint Venture [Member]	Jun. 30, 2013 PR Asset Portfolio 2013-1 International, LLC [Member]	Mar. 31, 2013 PR Asset Portfolio 2013-1 International, LLC [Member]	Jun. 30, 2013 E V E R T E C Inc [Member]	Jun. 30, 2012 E V E R T E C Inc [Member]	Apr. 12, 2013 E V E R T E C Inc [Member]	Dec. 31, 2012 E V E R T E C Inc [Member]	Sep. 30, 2010 E V E R T E C Inc [Member]	Apr. 12, 2013 E V E R T E C Inc [Member] IPO Member	Jun. 30, 2013 E V E R T E C Inc [Member] IPO Member	Jun. 30, 2013 E V E R T E C Inc [Member] Gross [Member]	Dec. 31, 2012 E V E R T E C Inc [Member] Gross [Member]	Apr. 12, 2013 Apollo Management LLC [Member] IPO Member	Apr. 12, 2013 Popular Inc [Member] IPO Member	Jun. 30, 2013 Performance Guarantee [Member] E V E R T E C Inc [Member]	Dec. 31, 2012 Performance Guarantee [Member] E V E R T E C Inc [Member]	Jun. 30, 2013 Financial Standby Letter Of Credit Member	Dec. 31, 2012 Financial Standby Letter Of Credit Member	Jun. 30, 2013 Financial Standby Letter Of Credit Member E V E R T E C Inc [Member]	Dec. 31, 2012 Financial Standby Letter Of Credit Member E V E R T E C Inc [Member]
Related Party Transaction [Line Items]
Sale of majority interest in subsidiaries, date of sale									Sep. 30, 2010						Apr. 12, 2013
Percentage Of Ownership Apollo Global Management LLC									67.60%	51.50%	29.10%	51.50%	51.00%
Equity Method Investment Ownership Percentage			24.90%	24.90%	24.90%	24.90%	24.90%	24.90%	32.40%	48.50%	33.50%	48.50%	49.00%
Guarantee Obligations Current Carrying Value																				$ 0	$ 1,000,000	$ 800,000	$ 600,000	$ 3,600,000	$ 2,900,000
Guarantee Obligations Term																								5-year period
Majority Interest Percentage			75.10%	75.10%	75.10%	75.10%	75.10%	75.10%
Proceeds from Equity Method Investment Dividends, Distributions and Return of Capital									0	131,000,000
Equity method investments, distributions									0	1,400,000
Stock Issued During Period Shares Other														28,800,000
Proceeds From Issuance Initial Public Offering														575,800,000
Stock Issued During Period, Shares, New Issues																		6,300,000
Sale Of Stock Number Of Shares Issued In Transaction														8,800,000					13,700,000
After Tax Gain On Ipo															156,600,000
Equity Method Investments	$ 265,524,000	$ 246,776,000							$ 50,155,000			$ 101,125,000				$ 63,598,000	$ 73,916,000