Intangible Assets and Goodwill - Additional Information (Detail) (RMCO, USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
RMCO
Goodwill [Line Items]
Amortization expense	$ 3,141,000	$ 2,192,000	$ 9,431,000	$ 7,369,000
Amortization expense for remainder of 2013	3,142,000		3,142,000
Amortization expense for year two	12,473,000		12,473,000
Amortization expense for year three	12,262,000		12,262,000
Amortization expense for year four	12,024,000		12,024,000
Amortization expense for year five	8,162,000		8,162,000
Amortization expense, thereafter	$ 23,823,000		$ 23,823,000