Debt - Additional Information (Detail) (USD $)	12 Months Ended		12 Months Ended							0 Months Ended	12 Months Ended			12 Months Ended	0 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Restated Credit Agreement [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member] Minimum [Member] LIBOR [Member]	Dec. 31, 2013 Revolving Credit Facility [Member] Minimum [Member] Base Rate [Member]	Dec. 31, 2013 Revolving Credit Facility [Member] Maximum [Member] LIBOR [Member]	Dec. 31, 2013 Revolving Credit Facility [Member] Maximum [Member] Base Rate [Member]	Feb. 25, 2014 Subsequent Event [Member]	Feb. 25, 2014 Subsequent Event [Member] Restated Credit Agreement [Member]	Dec. 31, 2013 Subsequent Event [Member] Restated Credit Agreement [Member]	Feb. 25, 2014 Subsequent Event [Member] Revolving Credit Facility [Member]	Feb. 25, 2014 Term Loan [Member] Subsequent Event [Member]	Dec. 31, 2013 Term Loan Subtranche One [Member]	Feb. 25, 2014 Term Loan Subtranche One [Member] Subsequent Event [Member]	Dec. 31, 2013 Term Loan Subtranche One [Member] Subsequent Event [Member]	Dec. 31, 2013 Term loan Subtranche Two [Member]	Feb. 25, 2014 Term loan Subtranche Two [Member] Subsequent Event [Member]	Dec. 31, 2013 Term loan Subtranche Two [Member] Subsequent Event [Member]
Debt Instrument [Line Items]
Revolving credit facility												$ 692,600,000
Term loan facility	140,625,000	148,125,000											153,800,000		60,000,000			6,300,000
Additional line of revolving credit facility												250,000,000
Maximum borrowing capacity including accordion agreement after amendment										1,100,000,000
Debt instrument, term										5 years
Line of credit facility expiry date			Feb. 28, 2019							Feb. 28, 2019	Feb. 28, 2019			Feb. 28, 2017	Feb. 25, 2017	Feb. 28, 2017	Nov. 03, 2017	Nov. 03, 2017	Nov. 03, 2017
Subordinated debt basket									450,000,000
Investments in unrestricted subsidiaries									$ 200,000,000
Revolving credit facility, description of loan				A revolving loan of $692.6 million, interest at a floating rate equal to, at the Company's option, either: (1) reserve adjusted London Interbank Offered Rate ("LIBOR"), plus a spread that ranges from, depending on the Company's cash flow leverage ratio, 250 to 300 basis points; or (2) Alternate Base Rate, plus a spread that ranges from, depending on the Company's cash flow leverage ratio, 150 to 200 basis points. "Alternate Base Rate," as defined in the agreement, means the highest of (i)the per annum rate which the administrative agent publicly announces from time to time as its prime lending rate, as in effect from time to time, (ii)the federal funds effective rate from time to time, plus 0.5% per annum and (iii) reserved adjusted LIBOR determined on a daily basis for a one month interest paid, plus 1.0% per annum;											A $60.0 million term loan maturing on February 25, 2017, interest at a floating rate equal to, at the Company’s option, either: (1) reserve adjusted LIBOR, plus a spread that ranges from 200 to 250 basis points, depending on the Company’s cash flow leverage ratio; or (2) Alternate Base Rate, plus a spread that ranges from 100 to 150 basis points, depending on the Company’s cash flow leverage ratio. Principal amortizes $3.0 million in 2014, $3.0 million in 2015, and $4.5 million in 2016 with the remaining principal due at the end of the term;			A $6.3 million term loan maturing on November 3, 2017, interest at a floating rate equal to, at the Company’s option, either: (1) reserve adjusted LIBOR, plus a spread that ranges from 250 to 300 basis points, depending on the Company’s cash flow leverage ratio; or (2) Alternate Base Rate, plus a spread that ranges from 150 to 200 basis points, depending on the Company’s cash flow leverage ratio. Principal amortizes $0.4 million in 2014, $0.5 million in 2015, $0.6 million in 2016 and $0.5 million in 2017 with the remaining principal due at the end of the term;
Basis spread on variable rate					2.50%	1.50%	3.00%	2.00%
Percentage to be added to base rate for alternate base rate	0.50%
Percentage to be added to adjusted base rate for alternate base rate	1.00%