Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Dec. 31, 2012		Jun. 30, 2012
Goodwill [Line Items]
Goodwill, beginning of period	$ 7,472	[1]	$ 7,472
Additions to goodwill during the period	7,431
Goodwill, end of period	$ 14,903		$ 7,472	[1]

[1] (a) Derived from the Company's audited financial statements as of June 30, 2012.