Summary of Significant Accounting Policies - Major Components of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property Plant And Equipment Useful Life And Values [Abstract]
Unproved property costs	$ 103,917	$ 78,453
Oilfield inventories	4,096	3,339
Other administrative property	2,710	2,954
Total property and equipment	110,723	84,746
Accumulated depreciation	(2,332)	(2,210)
TOTAL PROPERTY AND EQUIPMENT, NET	$ 108,391	$ 82,536