Property and Equipment - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Jun. 30, 2011	Jun. 30, 2010
Property, Plant and Equipment [Abstract]
Depreciation	$ 2,045	$ 502	$ 13,506	$ 1,472	$ 369