Commitments and Contingencies - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Commitments And Contingencies Disclosure [Line Items]
Contingent consideration	$ 80,476,000	$ 4,900,000
Uncertain tax positions	15,300,000
Contingent liabilities	55,000,000
Indemnification asset recorded	52,600,000
Prepaid Expenses and Other Current Assets [Member]
Commitments And Contingencies Disclosure [Line Items]
Indemnification asset recorded	2,500,000
Other Noncurrent Assets [Member]
Commitments And Contingencies Disclosure [Line Items]
Indemnification asset recorded	$ 50,100,000