Acquisition - Summary of Net Assets Acquired (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Nov. 01, 2012
Assets acquired:
Investments			$ 591,947
Cash			27,323
Value of insurance purchased			175,257
Goodwill	441,591	441,591	44,700
Other assets			45,573
Total assets			884,800
Liabilities assumed:
Policy liabilities			643,306
Other liabilities			7,747
Total liabilities			651,053
Total net assets acquired			$ 233,747