Annual report pursuant to section 13 and 15(d)

Quarterly Financial Data (Unaudited) - Additional Information (Detail)

v2.4.0.6
Quarterly Financial Data (Unaudited) - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Non Cash Compensation [Member]
Sep. 30, 2012
Non Cash Compensation [Member]
Jun. 30, 2012
Non Cash Compensation [Member]
Mar. 31, 2012
Non Cash Compensation [Member]
Dec. 31, 2011
Non Cash Compensation [Member]
Sep. 30, 2011
Non Cash Compensation [Member]
Jun. 30, 2011
Non Cash Compensation [Member]
Mar. 31, 2011
Non Cash Compensation [Member]
Dec. 31, 2010
Non Cash Compensation [Member]
Dec. 31, 2011
Deferred Tax Benefit [Member]
Dec. 31, 2011
Deferred Tax Benefit [Member]
Dec. 31, 2011
Acquisition-Related Costs [Member]
Sep. 30, 2011
Acquisition-Related Costs [Member]
Dec. 31, 2012
Amortization Of Retaintion Loans [Member]
Sep. 30, 2012
Amortization Of Retaintion Loans [Member]
Jun. 30, 2012
Amortization Of Retaintion Loans [Member]
Mar. 31, 2012
Amortization Of Retaintion Loans [Member]
Dec. 31, 2011
Amortization Of Retaintion Loans [Member]
Total expenses $ 672,114 $ 285,902 $ 204,616 $ 1,099 $ 1,054 $ 1,227 $ 1,364 $ 1,242 $ 688 $ 1,127 $ 957 $ 783     $ 2,271 $ 700 $ 2,051 $ 1,712 $ 1,791 $ 1,792 $ 1,634
Net loss $ (16,354) $ 3,893 $ (10,951)                   $ 18,329 $ 18,329