Fair Value Measures and Other Financial Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended						9 Months Ended
	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Fair Value, Inputs, Level 3 [Member] Market Approach Valuation Technique [Member]	Sep. 30, 2013 Fair Value, Inputs, Level 3 [Member] Market Approach Valuation Technique [Member]	Sep. 30, 2014 Fair Value, Inputs, Level 3 [Member] Market Approach Valuation Technique [Member]	Sep. 30, 2013 Fair Value, Inputs, Level 3 [Member] Market Approach Valuation Technique [Member]	Sep. 30, 2014 Fair Value, Inputs, Level 2 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2014 Three Interest Rate Swap [Member]	Sep. 30, 2014 Fourth Interest Rate Swap [Member]	Sep. 30, 2014 London Interbank Offered Rate (LIBOR) [Member] Three Interest Rate Swap [Member]	Sep. 30, 2014 London Interbank Offered Rate (LIBOR) [Member] Fourth Interest Rate Swap [Member]	Sep. 30, 2014 Interest Rate Swap [Member] Agreement	Sep. 30, 2014 Fixed Rate Debt [Member]	Dec. 31, 2013 Fixed Rate Debt [Member]	Sep. 30, 2014 Variable Rate Debt [Member]	Dec. 31, 2013 Variable Rate Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment charges	$ 400	$ 0	$ 400	$ 0	$ 400	$ 0	$ 400
Number of interest rate swap agreements														3
Notional amounts										230,000	70,000
Derivative, fixed interest rate										1.55%	1.50%
Counterparty paying												Counterparty paying the Company the floating one-month LIBOR rate	Counterparty paying the Company the floating one-month LIBOR rate
Reduction in blended interest rate		3.24%
Derivative maturity period		2018-01
Net liabilities								2,748	3,428
Accumulated comprehensive income to interest expense, future periods		3,887
Termination payment		2,742
Fair value of debt															619,362	816,582	305,379	305,653
Carrying value of debt															$ 593,170	$ 798,734	$ 300,000	$ 300,000