Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Expiration date of interest rate swap	Oct. 01, 2014
Transfers between levels 1,2 and 3	$ 0	$ 0