Commitments and Contingencies - Additional Information (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Commitments And Contingencies Disclosure [Line Items]
Contingent consideration	$ 83,803,000	$ 80,476,000
Uncertain tax positions		15,700,000
Contingent liabilities		52,500,000
Indemnification asset recorded		54,800,000
Prepaid Expenses and Other Current Assets [Member]
Commitments And Contingencies Disclosure [Line Items]
Indemnification asset recorded		12,100,000
Other Noncurrent Assets [Member]
Commitments And Contingencies Disclosure [Line Items]
Indemnification asset recorded		$ 42,700,000