Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measures (Detail) (Contingent Consideration [Member], Level 3 [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	$ 747,000	$ 685,000
Monte Carlo Analysis [Member] | Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Forecasted annual EBITDA	500,000	400,000
Weighted average cost of capital	14.00%	15.00%
U.S. Treasury yields	0.30%	0.10%
Monte Carlo Analysis [Member] | Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Forecasted annual EBITDA	$ 700,000	$ 600,000
Weighted average cost of capital	14.00%	15.00%
U.S. Treasury yields	1.10%	1.30%
Discounted Cash Flow [Member] | Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
U.S. Treasury yields	0.30%	0.10%
Credit spread	2.30%	1.30%
Discounted Cash Flow [Member] | Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
U.S. Treasury yields	1.10%	1.30%
Credit spread	3.80%	3.30%