Business Combinations, Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)		3 Months Ended								9 Months Ended	12 Months Ended
	Mar. 20, 2015	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Revenues, net		$ 165,858,000	$ 163,503,000	$ 155,621,000	$ 143,510,000	$ 135,286,000	$ 122,457,000	$ 119,738,000	$ 121,797,000		$ 628,492,000	$ 499,278,000	$ 478,452,000
Amortization expense		2,717,000	$ 2,642,000	$ 2,808,000	$ 2,059,000	2,157,000	$ 1,441,000	$ 1,489,000	$ 1,536,000		10,226,000	6,623,000	$ 6,300,000
Indefinite lived trade names and trademarks		900,000				$ 900,000				$ 900,000	$ 900,000	$ 900,000
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining amortization period (in years)											6 years 3 months 2 days
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining amortization period (in years)											4 years 6 months
Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining amortization period (in years)											3 years 6 months
Leasehold benefits
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining amortization period (in years)											3 years 4 months 24 days
Trade names and trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining amortization period (in years)											6 years
RPM Direct LLC and RPM Data Solutions LLC
Acquired Finite-Lived Intangible Assets [Line Items]
Business acquisition, cash consideration	$ 46,925,000
Working capital adjustments included in business acquisitions cash consideration	$ 75,000
Business acquisition, restricted stock issued	122,131
Earnout payments, fair value											$ 4,060,000
Business acquisition, amount of restricted stock units	$ 4,150,000
Number of restricted stock units, granted (in shares)	113,302
Aggregate fair value of restricted stock units granted	$ 3,850,000
Acquisition related costs											$ 303,000
Revenues, net										32,818,000
RPM Direct LLC and RPM Data Solutions LLC | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (in years)											5 years 8 months 12 days
RPM Direct LLC and RPM Data Solutions LLC | Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (in years)											3 years
RPM Direct LLC and RPM Data Solutions LLC | Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (in years)											5 years
RPM Direct LLC and RPM Data Solutions LLC | Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life (in years)											4 years 7 months 6 days
RPM Direct LLC and RPM Data Solutions LLC | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Earn out consideration payable	$ 23,000,000	$ 23,000,000								$ 23,000,000	$ 23,000,000