Commitments and Contingencies - Additional Information (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Commitments And Contingencies Disclosure [Line Items]
Contingent consideration	$ 86,723,000	$ 80,476,000
Uncertain tax positions	21,400,000	21,600,000
All 2013 Acquisitions [Member]
Commitments And Contingencies Disclosure [Line Items]
Contingent consideration	53,700,000	83,800,000
Uncertain tax positions	15,500,000	15,500,000
Indemnification asset recorded	$ 56,200,000	$ 56,200,000