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Long-Term Debt - Additional Information (Detail) (USD $)	0 Months Ended	9 Months Ended					0 Months Ended			9 Months Ended	0 Months Ended		9 Months Ended				9 Months Ended		9 Months Ended			9 Months Ended						9 Months Ended
	Jan. 09, 2012	Sep. 30, 2014	Sep. 30, 2013	Apr. 17, 2014	Apr. 16, 2014	Dec. 31, 2013	May 20, 2014 Agreement [Member]	Sep. 30, 2014 Credit Agreement [Member]	Apr. 17, 2014 Credit Agreement [Member]	Sep. 30, 2014 Unsecured Senior Notes [Member]	Jan. 09, 2012 Sun Trust Term Loan [Member]	Jan. 09, 2012 Sun Trust Revolver [Member]	Sep. 30, 2014 JPM Term Loan [Member]	Sep. 30, 2014 Wells Fargo Revolver [Member]	Dec. 31, 2013 Wells Fargo Revolver [Member]	Jun. 30, 2013 Wells Fargo Revolver [Member] Beecher Acquisition [Member]	Sep. 30, 2014 Bank Of America Loan Term Loan [Member]	Jun. 30, 2013 Bank Of America Loan Term Loan [Member] Beecher Acquisition [Member]	Sep. 30, 2014 Private Placement [Member] Series B [Member]	Sep. 30, 2014 Private Placement [Member] Series A [Member]	Sep. 30, 2014 Private Placement [Member] Senior Notes[Member]	Sep. 30, 2014 Line of Credit [Member] Wells Fargo Revolver [Member]	Sep. 30, 2014 Line of Credit [Member] Bank Of America Loan Term Loan [Member]	Sep. 30, 2014 Term Loan [Member]	May 20, 2014 Term Loan [Member]	Sep. 30, 2014 Revolving Credit Facility [Member]	May 20, 2014 Revolving Credit Facility [Member]	Sep. 30, 2014 Revolving Loans [Member]	Sep. 30, 2014 New Master Agreement [Member]	Sep. 30, 2014 LIBOR [Member]
Debt Instrument [Line Items]
Unsecured senior notes outstanding																			$ 100,000,000	$ 100,000,000	$ 200,000,000								$ 0
Debt instrument, issuance date																			Jul. 15, 2004	Sep. 15, 2004
Debt instrument interest rate stated percentage										4.20%									6.08%	5.57%
Debt instrument, maturity date														Dec. 31, 2016			Dec. 31, 2016		Jul. 15, 2014	Sep. 15, 2011
Notes redeemed on maturity date																				100,000,000
Revolving and term loan	50,000,000										100,000,000	50,000,000	100,000,000
Credit facility, outstanding amount		536,250,000			25,000,000	230,000,000		550,000,000								50,000,000									550,000,000	475,000,000	375,000,000
Revolving and term loan																		30,000,000					30,000,000
Potential increased in line of credit facility				500,000,000										100,000,000
Letter of credit usage fee, minimum																						1.00%
Letter of credit usage fee, maximum																						1.40%
LIBOR below base rate																						1.00%
Availability fees, minimum																						0.175%
Availability fees, maximum																						0.25%
Interest rate, minimum																						1.00%
Interest rate, maximum																						1.40%
Borrowings outstanding														0	0
30-day Adjusted LIBOR Rate																														0.19%
Unsecured revolving credit facility				800,000,000					1,350,000,000
Unsecured term loans				550,000,000
Term Loan Agreement		475,000,000	31,863,000				230,000,000
Line of credit facility interest rate above adjusted LIBOR rate																								1.375%		1.175%
Letter of credit fees		0.20%
Proceeds from lines of credit		475,000,000	31,863,000																									0
Debt instrument, face amount										$ 500,000,000
Debt instrument maturity year										2024

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Adjusted LIBOR rate

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Debt Instruments Maturity Year

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Fees On Loans Maximum

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Letter Of Credit Usage Fee Maximum

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LIBOR Rate Below Base Rate

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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Date the debt instrument was issued, in CCYY-MM-DD format.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the operating cycle if longer, excluding current portion.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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