Derivative Financial Instruments - Additional Information (Detail) (USD $)		6 Months Ended				12 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 July 2012 Swap Transaction [Member] Interest Rate Swap [Member]	Jun. 30, 2014 July 2012 Swap Transaction [Member] Forward Contracts [Member]	Jun. 30, 2014 June 2013 Swap Transaction [Member] Interest Rate Swap [Member]	Jun. 30, 2014 June 2013 Swap Transaction [Member] Forward Contracts [Member]	Dec. 31, 2013 2013 Note Purchase Agreement [Member]	Jun. 30, 2014 2013 Note Purchase Agreement [Member]
Derivative [Line Items]
Derivative contract period		3 years	2 years	7 years	7 months
Amount of debt hedged	$ 150,000,000
Outstanding debt percentage	27.70%
Gain realized by the company						900,000
Swap transaction gain to be reclassified during next 12 months							100,000
Minimum debt default amount	25,000,000
Fair value	$ 600,000