Income Taxes - Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Deferred tax liabilities:
Insurance intangible	$ 468,799	$ 493,822
Variable interest entities	30,865	14,149
Investments	156,377	138,072
Unearned premiums and credit fees	100,058	104,589
Other	33,751	33,835
Total deferred tax liabilities	789,850	784,467
Deferred tax assets:
Net operating loss and capital carryforward	1,741,477	1,890,551
Loss reserves	167,242	185,881
Compensation	6,112	5,276
AMT Credits	15,761	10,359
Other	9,538	9,539
Sub total deferred tax assets	1,940,130	2,101,606
Valuation allowance	1,152,235	1,319,218
Total deferred tax assets	787,895	782,388
Net deferred tax asset (liability)	$ (1,955)	$ (2,079)