Debt - Additional Information (Detail) (Senior Unsecured Credit Facilities, USD $)					0 Months Ended
	Mar. 31, 2014	Oct. 12, 2012	Mar. 31, 2014 Maximum	Mar. 31, 2014 Minimum	Oct. 12, 2012 KeyBank National Association	Mar. 31, 2014 Acquisition Covenants Maximum	Mar. 31, 2014 Acquisition Covenants Minimum
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 200,000,000
Debt instrument borrowing period					5 years
Credit Agreement accordion feature, incremental revolver or term loan amount		50,000,000
Leverage Ratio			3.50			3.5
Interest Coverage Ratio				3.0			3.0
Remaining borrowing capacity	66,082,000
Borrowings outstanding	0
Amount of outstanding letter of credit	$ 4,070,000