Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended						12 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Other Intangible Assets [Member]	Dec. 31, 2013 Other Intangible Assets [Member]	Sep. 30, 2014 Accrued Liabilities [Member]	Dec. 31, 2013 Accrued Liabilities [Member]	Dec. 31, 2013 Old Credit Facilities [Member]	Dec. 31, 2013 Old Credit Facilities [Member] Term Loans Rate	Sep. 30, 2014 New Credit Facilities [Member]	Sep. 30, 2014 New Credit Facilities [Member] Term Loans Rate	Sep. 30, 2014 New policy [Member] Term Loans
Derivative [Line Items]
Interest Rate Derivative Assets, at Fair Value					$ 141,000	$ 0
Interest Rate Derivative Liabilities, at Fair Value							0	927,000
Derivative, Fixed Interest Rate										1.11%		1.04%
Derivative, Maturity Years										3 years			3 years
Derivative, Maturity Date									Jul. 01, 2014		Aug. 01, 2017
Derivative, Basis Spread on Variable Rate												1.35%
Debt Instrument, Interest Rate at Period End												2.39%
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion	233,000	106,000	256,000	141,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net			$ 1,600,000