Acquisition - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014 Acquisition	Dec. 31, 2013
Business Acquisition, Contingent Consideration [Line Items]
Number of acquisitions completed	0
Aggregate purchase price		$ 849,000,000
Deferred payments		36,800,000
Contingent earn-out payment	83,803,000	80,476,000
Aggregate purchase price, net of cash acquired		35,600,000
Contingent consideration future payments, low range	0
Contingent consideration future payments, high range	117,300,000
Contingent consideration payable in second half of 2014	83,800,000
Contingent consideration payable in first quarter of 2015	83,800,000
Percentage increase in revenue after acquisition		12.00%
Percentage of increase in income before taxes after acquisition		3.00%
Percentage of increase in net income after acquisition		3.00%
Percentage of increase in earnings per share basic after acquisition		3.00%
Percentage of increase in earnings per share diluted after acquisition		3.00%
Uncertain tax positions		15,700,000
Contingent liabilities		52,500,000
Indemnification asset recorded		54,800,000
Prepaid Expenses and Other Current Assets [Member]
Business Acquisition, Contingent Consideration [Line Items]
Indemnification asset recorded		12,100,000
Other Noncurrent Assets [Member]
Business Acquisition, Contingent Consideration [Line Items]
Indemnification asset recorded		42,700,000
Minimum [Member] | Other Noncurrent Assets [Member]
Business Acquisition, Contingent Consideration [Line Items]
Indemnification asset recorded		50,700,000
Maximum [Member] | Other Noncurrent Assets [Member]
Business Acquisition, Contingent Consideration [Line Items]
Indemnification asset recorded		54,800,000
All 2013 Acquisitions [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent earn-out payment		83,800,000
Uncertain tax positions		15,700,000
Contingent liabilities		52,500,000
Indemnification asset recorded		54,800,000
All 2013 Acquisitions [Member] | Prepaid Expenses and Other Current Assets [Member]
Business Acquisition, Contingent Consideration [Line Items]
Indemnification asset recorded		12,100,000
All 2013 Acquisitions [Member] | Other Noncurrent Assets [Member]
Business Acquisition, Contingent Consideration [Line Items]
Indemnification asset recorded		$ 42,700,000