Fair Value Measures and Other Financial Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended			6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Three Interest Rate Swap [Member]	Jun. 30, 2014 Fourth Interest Rate Swap [Member]	Jun. 30, 2014 London Interbank Offered Rate (LIBOR) [Member] Three Interest Rate Swap [Member]	Jun. 30, 2014 London Interbank Offered Rate (LIBOR) [Member] Fourth Interest Rate Swap [Member]	Jun. 30, 2014 Interest Rate Swap [Member] Agreement	Jun. 30, 2014 Fair Value, Inputs, Level 3 [Member] Market Approach Valuation Technique [Member]	Jun. 30, 2013 Fair Value, Inputs, Level 3 [Member] Market Approach Valuation Technique [Member]	Jun. 30, 2014 Fair Value, Inputs, Level 3 [Member] Market Approach Valuation Technique [Member]	Jun. 30, 2013 Fair Value, Inputs, Level 3 [Member] Market Approach Valuation Technique [Member]	Jun. 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]	Jun. 30, 2014 Fixed Rate Debt [Member]	Dec. 31, 2013 Fixed Rate Debt [Member]	Jun. 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							$ 0	$ 0	$ 0	$ 0
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											4,915	3,428
Accumulated comprehensive income to interest expense, future periods	4,101
Termination payment	4,924
Fair value of debt													713,117	816,582	305,509	305,653
Carrying value of debt													$ 676,760	$ 798,734	$ 300,000	$ 300,000