Indebtedness - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		3 Months Ended			3 Months Ended			3 Months Ended		0 Months Ended	3 Months Ended	0 Months Ended		3 Months Ended	0 Months Ended	3 Months Ended
	Aug. 12, 2013	Mar. 31, 2014	Oct. 03, 2007	Mar. 31, 2014 Copal [Member]	Mar. 31, 2014 Two Thousand And Seven Revolving Credit Facility [Member]	Sep. 28, 2007 Two Thousand And Seven Revolving Credit Facility [Member]	Mar. 31, 2014 Twenty Ten Senior Notes [Member]	Mar. 31, 2014 Series Two Thousand Five Dash One Notes [Member]	Sep. 30, 2005 Series Two Thousand Five Dash One Notes [Member]	Mar. 31, 2014 Series Two Thousand Seven Dash One Notes [Member]	Mar. 31, 2014 Senior Notes Seven Point Six One Percent Due September Thirty Two Thousand Five [Member]	Apr. 18, 2012 Two Thousand Twelve Facility [Member]	Mar. 31, 2014 Two Thousand Twelve Facility [Member]	Apr. 18, 2012 Two Thousand Twelve Facility [Member] Minimum [Member]	Apr. 18, 2012 Two Thousand Twelve Facility [Member] Maximum [Member]	Mar. 31, 2014 Twenty Twelve Senior Notes [Member]	Aug. 12, 2013 Twenty Thirteen Senior Notes [Member]	Mar. 31, 2014 Twenty Thirteen Senior Notes [Member]	Mar. 31, 2013 Twenty Thirteen Senior Notes [Member]	Mar. 31, 2014 Term Loan Two Thousand Eight [Member]
Debt Instrument [Line Items]
Date the credit facility was entered		Apr. 18, 2012			Sep. 28, 2007													Aug. 12, 2013
Date of expiry of credit facility		Apr. 17, 2017			Sep. 27, 2012
Senior unsecured revolving credit facility			$ 1,000,000,000			$ 1,000,000,000						$ 1,000,000,000
Interest on borrowings under the Term Loan												LIBOR plus a premium that can range from 77.5 basis points to 120 basis points per annum LIBOR plus a premium that can range from 77.5 basis points to 120 basis points per annum
Quarterly facility fees													range from 10 basis points of the facility amount to 17.5 basis points range from 10 basis points of the facility amount to 17.5 basis points
Interest rate, LIBOR marginal basis points														77.50%	120.00%
Facility quarterly fee, basis points per annum														10.00%	17.50%
Debt to EBITDA ratio not to exceed at the end of any fiscal quarter										The Company must also not permit its Debt/EBITDA ratio to exceed 4.0 to 1.0 at the end of any fiscal quarter The Company must also not permit its Debt/EBITDA ratio to exceed 4.0 to 1.0 at the end of any fiscal quarter			Debt to EBITDA Ratio of not more than 4 to 1 at the end of any fiscal quarter Debt to EBITDA Ratio of not more than 4 to 1 at the end of any fiscal quarter
Non-interest bearing note issued				14,200,000
Notes due description				(i) the fourth anniversary date of the note or (ii) within a time frame set forth in the acquisition agreement relating to the resolution of certain income tax uncertainties pertaining to the transaction (i) the fourth anniversary date of the note or (ii) within a time frame set forth in the acquisition agreement relating to the resolution of certain income tax uncertainties pertaining to the transaction
Notes repayment description				(i) two business days subsequent to the exercise of the put/call option to acquire the remaining shares of Copal or (ii) the tenth anniversary date of the issuance of the note (i) two business days subsequent to the exercise of the put/call option to acquire the remaining shares of Copal or (ii) the tenth anniversary date of the issuance of the note
Date of agreement with the lenders for the five year senior unsecured term loan							Aug. 19, 2010	Sep. 30, 2005		Sep. 07, 2007						Aug. 20, 2012				May 07, 2008
Debt, aggregate principal amount							500,000,000		300,000,000	300,000,000	300,000,000					500,000,000	500,000,000
Senior Unsecured Notes, interest								4.98%		6.06%						4.50%	4.875%
Maturity date of Senior Unsecured Notes							Sep. 01, 2020	Sep. 30, 2015		Sep. 07, 2017						Sep. 01, 2022		Sep. 01, 2024
Prepayment and purchase feature of Senior Unsecured Notes	The Company may prepay the 2013 Senior Notes, in whole or in part, at any time at a price equal to 100% of the principal amount being prepaid, plus accrued and unpaid interest and a Make-Whole Amount The Company may prepay the 2013 Senior Notes, in whole or in part, at any time at a price equal to 100% of the principal amount being prepaid, plus accrued and unpaid interest and a Make-Whole Amount						The Company may prepay the 2010 Senior Notes, in whole or in part, at any time at a price equal to 100% of the principal The Company may prepay the 2010 Senior Notes, in whole or in part, at any time at a price equal to 100% of the principal	In the event that Moody’s pays all, or part, of the Series 2005-1 Notes in advance of their maturity, such prepayment will be subject to a Make Whole Amount In the event that Moody’s pays all, or part, of the Series 2005-1 Notes in advance of their maturity, such prepayment will be subject to a Make Whole Amount		The Company may prepay the Series 2007-1 Notes, in whole or in part, at any time at a price equal to 100% of the principal amount The Company may prepay the Series 2007-1 Notes, in whole or in part, at any time at a price equal to 100% of the principal amount						The Company may prepay the 2012 Senior Notes, in whole or in part, at any time at a price equal to 100% of the principal amount being prepaid, plus accrued and unpaid interest and a Make-Whole Amount The Company may prepay the 2012 Senior Notes, in whole or in part, at any time at a price equal to 100% of the principal amount being prepaid, plus accrued and unpaid interest and a Make-Whole Amount
Percentage of principal amount being prepaid, plus accrued and unpaid interest		100.00%								100.00%							100.00%
Percentage of principal amount, plus accrued and unpaid interest to the date of purchase							101.00%									101.00%	101.00%
Minimum amount for default on senior notes payable		50,000,000														50,000,000	50,000,000
Minimum percentage for default on senior notes payable							Upon the occurrence and during the continuation of an event of default under the 2010 Indenture, the notes may become immediately due and payable either automatically or by the vote of the holders of more than 25% of the aggregate principal amount of all of the notes then outstanding. Upon the occurrence and during the continuation of an event of default under the 2010 Indenture, the notes may become immediately due and payable either automatically or by the vote of the holders of more than 25% of the aggregate principal amount of all of the notes then outstanding.									Upon the occurrence and during the continuation of an event of default under the Indenture, the 2012 Senior notes may become immediately due and payable either automatically or by the vote of the holders of more than 25% of the aggregate principal amount of all of the notes then outstanding Upon the occurrence and during the continuation of an event of default under the Indenture, the 2012 Senior notes may become immediately due and payable either automatically or by the vote of the holders of more than 25% of the aggregate principal amount of all of the notes then outstanding	Upon the occurrence and during the continuation of an event of default under the 2013 Indenture, the 2013 Senior Notes may become immediately due and payable either automatically or by the vote of the holders of more than 25% of the aggregate principal amount of all of the notes then outstanding. Upon the occurrence and during the continuation of an event of default under the 2013 Indenture, the 2013 Senior Notes may become immediately due and payable either automatically or by the vote of the holders of more than 25% of the aggregate principal amount of all of the notes then outstanding.
Minimum percentage of aggregate principal amount of all notes							25.00%									25.00%			25.00%
Issuance of additional principal amount of Senior Notes within five years from time to time										500,000,000
Interest rate swaps total notional amount																				150,000,000
Aggregate Amount Due At Maturity							50,000,000											50,000,000
Interest Reversal		$ 2,000,000