Beecher's Acquisitions Accounted for as Business Combinations (Detail) (USD $)	6 Months Ended		1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jul. 01, 2013 Subsequent to January 1, 2009 [Member] Beecher [Member]
Subsequent Event [Line Items]
Date of Acquisition			Jul. 01, 2013
Cash Paid	$ 14,366,000	$ 428,612,000	$ 364,644,000
Recorded Earn-out Payable
Net Assets Acquired	15,848,000	465,184,000	364,644,000
Maximum Potential Earn-out Payable